Page 1
Exercise 11A
1. Find the SP when:
(i). CP = ? 950, gain = 6%
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + 6) /100) × 950}
= {(106 /100) × 950}
= 100700/100
= ?1007
(ii). CP = ? 9600, gain = 16 2/3 %
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + (50/3)) /100) × 9600}
= {((((300 + 50)/3)) /100) × 9600}
= {((350/3) /100) × 9600}
= {((350/3) × (1/100)) × 9600}
= {(350/300) × 9600}
= {(350/3) × 96}
= {350 × 32}
= ?11200
(iii). CP = ? 1540, loss = 4%
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - 4) /100) × 1540}
= {(96 /100) × 1540}
= 147840/100
= ?1478.40
(iv). CP = ? 8640, loss = 12 1/2 %
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - (25/2)) /100) × 8640}
= {(((200 - 25)/2)) /100) × 8640}
= {((175/2) /100) × 8640}
= {((175/2) × (1/100)) × 8640}
Page 2
Exercise 11A
1. Find the SP when:
(i). CP = ? 950, gain = 6%
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + 6) /100) × 950}
= {(106 /100) × 950}
= 100700/100
= ?1007
(ii). CP = ? 9600, gain = 16 2/3 %
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + (50/3)) /100) × 9600}
= {((((300 + 50)/3)) /100) × 9600}
= {((350/3) /100) × 9600}
= {((350/3) × (1/100)) × 9600}
= {(350/300) × 9600}
= {(350/3) × 96}
= {350 × 32}
= ?11200
(iii). CP = ? 1540, loss = 4%
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - 4) /100) × 1540}
= {(96 /100) × 1540}
= 147840/100
= ?1478.40
(iv). CP = ? 8640, loss = 12 1/2 %
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - (25/2)) /100) × 8640}
= {(((200 - 25)/2)) /100) × 8640}
= {((175/2) /100) × 8640}
= {((175/2) × (1/100)) × 8640}
= {(175/200) × 8640}
= {1512000/200}
= ?7560
2. Find the gain or loss percent when:
(i). CP = ? 2400 and SP = ? 2592
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (2592-2400)
= ? 192
Gain % = {(gain/CP) × 100}
= {(192/2400) × 100}
= {192/24}
= 8%
(ii). CP = ? 1650 and SP = ? 1452
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
= ? (1650 - 1452)
= ? 198
Loss % = {(Loss/CP) × 100}
= {(198/1650) × 100}
= {19800/1650}
= 12%
(iii). CP = ? 12000 and SP = ? 12800
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (12800 - 12000)
= ? 800
Gain % = {(gain/CP) × 100}
= {(800/12000) × 100}
= {800/120}
= 6 2/3 %
= 6.66%
(iv). CP = ? 1800 and SP = ? 1611
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
Page 3
Exercise 11A
1. Find the SP when:
(i). CP = ? 950, gain = 6%
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + 6) /100) × 950}
= {(106 /100) × 950}
= 100700/100
= ?1007
(ii). CP = ? 9600, gain = 16 2/3 %
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + (50/3)) /100) × 9600}
= {((((300 + 50)/3)) /100) × 9600}
= {((350/3) /100) × 9600}
= {((350/3) × (1/100)) × 9600}
= {(350/300) × 9600}
= {(350/3) × 96}
= {350 × 32}
= ?11200
(iii). CP = ? 1540, loss = 4%
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - 4) /100) × 1540}
= {(96 /100) × 1540}
= 147840/100
= ?1478.40
(iv). CP = ? 8640, loss = 12 1/2 %
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - (25/2)) /100) × 8640}
= {(((200 - 25)/2)) /100) × 8640}
= {((175/2) /100) × 8640}
= {((175/2) × (1/100)) × 8640}
= {(175/200) × 8640}
= {1512000/200}
= ?7560
2. Find the gain or loss percent when:
(i). CP = ? 2400 and SP = ? 2592
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (2592-2400)
= ? 192
Gain % = {(gain/CP) × 100}
= {(192/2400) × 100}
= {192/24}
= 8%
(ii). CP = ? 1650 and SP = ? 1452
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
= ? (1650 - 1452)
= ? 198
Loss % = {(Loss/CP) × 100}
= {(198/1650) × 100}
= {19800/1650}
= 12%
(iii). CP = ? 12000 and SP = ? 12800
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (12800 - 12000)
= ? 800
Gain % = {(gain/CP) × 100}
= {(800/12000) × 100}
= {800/120}
= 6 2/3 %
= 6.66%
(iv). CP = ? 1800 and SP = ? 1611
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
= ? (1800 - 1611)
= ? 189
Loss % = {(Loss/CP) × 100}
= {(189/1800) × 100}
= {189/18}
= 10 1/2%
= 10.5%
3. Find the CP when:
(i). SP = ? 924, gain = 10%
Solution:-
By using the formula, we have:
CP = ? {(100/ (100 + gain %)) × SP}
= {(100/ (100 + 10)) × 924}
= {(100/ 110) × 924}
= {92400/110}
= ? 840
(ii). SP = ? 1755, gain = 12 1/2 %
Solution:-
Gain = 12 1/2 = 25/2
By using the formula, we have:
CP = ? {(100/ (100 + gain %)) × SP}
= {(100/ (100 + (25/2))) × 1755}
= {(100/ ((200 + 25)/2)) × 1755}
= {(200/ 225) × 1755}
= {351000/225}
= ? 1560
(iii). SP = ? 8510, loss = 8%
Solution:-
By using the formula, we have:
CP = ? {(100/ (100 - loss %)) × SP}
= {(100/ (100 - 8)) × 8510}
= {(100/ 92) × 8510}
= {851000/92}
= ? 9250
(iv). SP = ? 5600, loss = 6 2/3 %
Solution:-
Loss = 6 2/3 = 20/3
By using the formula, we have:
Page 4
Exercise 11A
1. Find the SP when:
(i). CP = ? 950, gain = 6%
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + 6) /100) × 950}
= {(106 /100) × 950}
= 100700/100
= ?1007
(ii). CP = ? 9600, gain = 16 2/3 %
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + (50/3)) /100) × 9600}
= {((((300 + 50)/3)) /100) × 9600}
= {((350/3) /100) × 9600}
= {((350/3) × (1/100)) × 9600}
= {(350/300) × 9600}
= {(350/3) × 96}
= {350 × 32}
= ?11200
(iii). CP = ? 1540, loss = 4%
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - 4) /100) × 1540}
= {(96 /100) × 1540}
= 147840/100
= ?1478.40
(iv). CP = ? 8640, loss = 12 1/2 %
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - (25/2)) /100) × 8640}
= {(((200 - 25)/2)) /100) × 8640}
= {((175/2) /100) × 8640}
= {((175/2) × (1/100)) × 8640}
= {(175/200) × 8640}
= {1512000/200}
= ?7560
2. Find the gain or loss percent when:
(i). CP = ? 2400 and SP = ? 2592
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (2592-2400)
= ? 192
Gain % = {(gain/CP) × 100}
= {(192/2400) × 100}
= {192/24}
= 8%
(ii). CP = ? 1650 and SP = ? 1452
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
= ? (1650 - 1452)
= ? 198
Loss % = {(Loss/CP) × 100}
= {(198/1650) × 100}
= {19800/1650}
= 12%
(iii). CP = ? 12000 and SP = ? 12800
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (12800 - 12000)
= ? 800
Gain % = {(gain/CP) × 100}
= {(800/12000) × 100}
= {800/120}
= 6 2/3 %
= 6.66%
(iv). CP = ? 1800 and SP = ? 1611
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
= ? (1800 - 1611)
= ? 189
Loss % = {(Loss/CP) × 100}
= {(189/1800) × 100}
= {189/18}
= 10 1/2%
= 10.5%
3. Find the CP when:
(i). SP = ? 924, gain = 10%
Solution:-
By using the formula, we have:
CP = ? {(100/ (100 + gain %)) × SP}
= {(100/ (100 + 10)) × 924}
= {(100/ 110) × 924}
= {92400/110}
= ? 840
(ii). SP = ? 1755, gain = 12 1/2 %
Solution:-
Gain = 12 1/2 = 25/2
By using the formula, we have:
CP = ? {(100/ (100 + gain %)) × SP}
= {(100/ (100 + (25/2))) × 1755}
= {(100/ ((200 + 25)/2)) × 1755}
= {(200/ 225) × 1755}
= {351000/225}
= ? 1560
(iii). SP = ? 8510, loss = 8%
Solution:-
By using the formula, we have:
CP = ? {(100/ (100 - loss %)) × SP}
= {(100/ (100 - 8)) × 8510}
= {(100/ 92) × 8510}
= {851000/92}
= ? 9250
(iv). SP = ? 5600, loss = 6 2/3 %
Solution:-
Loss = 6 2/3 = 20/3
By using the formula, we have:
CP = ? {(100/ (100 – loss %)) × SP}
= {(100/ (100 - (20/3))) × 5600}
= {(100/ ((300 - 20)/3)) × 5600}
= {(300/ 280) × 5600}
= {168000/28}
= ? 6000
4. Sudhir bought an almirah for ? 13600 and spent ? 400 on its transportation. He sold it for ? 16800.
Find his gain percent.
Solution:-
From the question,
Sudhir bought an almirah for = ? 13600 = cost price
Transportation cost = ? 400
The total cost price of almirah = ? (13600 + 400)
= ? 14000
He sold it for = ? 16800 = Selling price
By comparing SP and CP = SP > CP, so there is a gain
Gain = SP – CP
= 16800 – 14000
= ? 2800
Gain % = {(gain/CP) × 100}
= {(2800/14000) × 100}
= {2800/140}
= 20%
5. Ravi purchased an old house for ?765000 and spent ?115000 on its repairs. Then, he sold it a gain
of 5%. How much did he get?
Solution:-
From the question,
Ravi purchased an old house for = ? 765000 = Cost price
He spent on its repairs = ? 115000
Total cost price of old house = (765000 + 115000)
= ? 880000
Then, he sold it at a gain of 5%
SP = {((100 + gain %) /100) × CP}
= {((100 + 5) /100) × 880000}
= {(105 /100) × 880000}
= 105 × 8800
= ? 924000
?the selling price of the house is ? 924000
6. A vendor buys lemons at ?25 per dozen and sells them at the rate of 5 for ? 12. Find his gain or
loss percent.
Page 5
Exercise 11A
1. Find the SP when:
(i). CP = ? 950, gain = 6%
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + 6) /100) × 950}
= {(106 /100) × 950}
= 100700/100
= ?1007
(ii). CP = ? 9600, gain = 16 2/3 %
Solution:-
We have,
SP = {((100 + gain %) /100) × CP}
= {((100 + (50/3)) /100) × 9600}
= {((((300 + 50)/3)) /100) × 9600}
= {((350/3) /100) × 9600}
= {((350/3) × (1/100)) × 9600}
= {(350/300) × 9600}
= {(350/3) × 96}
= {350 × 32}
= ?11200
(iii). CP = ? 1540, loss = 4%
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - 4) /100) × 1540}
= {(96 /100) × 1540}
= 147840/100
= ?1478.40
(iv). CP = ? 8640, loss = 12 1/2 %
Solution:-
We have,
SP = {((100 - loss %) /100) × CP}
= {((100 - (25/2)) /100) × 8640}
= {(((200 - 25)/2)) /100) × 8640}
= {((175/2) /100) × 8640}
= {((175/2) × (1/100)) × 8640}
= {(175/200) × 8640}
= {1512000/200}
= ?7560
2. Find the gain or loss percent when:
(i). CP = ? 2400 and SP = ? 2592
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (2592-2400)
= ? 192
Gain % = {(gain/CP) × 100}
= {(192/2400) × 100}
= {192/24}
= 8%
(ii). CP = ? 1650 and SP = ? 1452
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
= ? (1650 - 1452)
= ? 198
Loss % = {(Loss/CP) × 100}
= {(198/1650) × 100}
= {19800/1650}
= 12%
(iii). CP = ? 12000 and SP = ? 12800
Solution:-
Since (SP) > (CP), so there is a gain
Gain = (SP) – (CP)
= ? (12800 - 12000)
= ? 800
Gain % = {(gain/CP) × 100}
= {(800/12000) × 100}
= {800/120}
= 6 2/3 %
= 6.66%
(iv). CP = ? 1800 and SP = ? 1611
Solution:-
Since (SP) < (CP), so there is a loss
Loss = (CP) – (SP)
= ? (1800 - 1611)
= ? 189
Loss % = {(Loss/CP) × 100}
= {(189/1800) × 100}
= {189/18}
= 10 1/2%
= 10.5%
3. Find the CP when:
(i). SP = ? 924, gain = 10%
Solution:-
By using the formula, we have:
CP = ? {(100/ (100 + gain %)) × SP}
= {(100/ (100 + 10)) × 924}
= {(100/ 110) × 924}
= {92400/110}
= ? 840
(ii). SP = ? 1755, gain = 12 1/2 %
Solution:-
Gain = 12 1/2 = 25/2
By using the formula, we have:
CP = ? {(100/ (100 + gain %)) × SP}
= {(100/ (100 + (25/2))) × 1755}
= {(100/ ((200 + 25)/2)) × 1755}
= {(200/ 225) × 1755}
= {351000/225}
= ? 1560
(iii). SP = ? 8510, loss = 8%
Solution:-
By using the formula, we have:
CP = ? {(100/ (100 - loss %)) × SP}
= {(100/ (100 - 8)) × 8510}
= {(100/ 92) × 8510}
= {851000/92}
= ? 9250
(iv). SP = ? 5600, loss = 6 2/3 %
Solution:-
Loss = 6 2/3 = 20/3
By using the formula, we have:
CP = ? {(100/ (100 – loss %)) × SP}
= {(100/ (100 - (20/3))) × 5600}
= {(100/ ((300 - 20)/3)) × 5600}
= {(300/ 280) × 5600}
= {168000/28}
= ? 6000
4. Sudhir bought an almirah for ? 13600 and spent ? 400 on its transportation. He sold it for ? 16800.
Find his gain percent.
Solution:-
From the question,
Sudhir bought an almirah for = ? 13600 = cost price
Transportation cost = ? 400
The total cost price of almirah = ? (13600 + 400)
= ? 14000
He sold it for = ? 16800 = Selling price
By comparing SP and CP = SP > CP, so there is a gain
Gain = SP – CP
= 16800 – 14000
= ? 2800
Gain % = {(gain/CP) × 100}
= {(2800/14000) × 100}
= {2800/140}
= 20%
5. Ravi purchased an old house for ?765000 and spent ?115000 on its repairs. Then, he sold it a gain
of 5%. How much did he get?
Solution:-
From the question,
Ravi purchased an old house for = ? 765000 = Cost price
He spent on its repairs = ? 115000
Total cost price of old house = (765000 + 115000)
= ? 880000
Then, he sold it at a gain of 5%
SP = {((100 + gain %) /100) × CP}
= {((100 + 5) /100) × 880000}
= {(105 /100) × 880000}
= 105 × 8800
= ? 924000
?the selling price of the house is ? 924000
6. A vendor buys lemons at ?25 per dozen and sells them at the rate of 5 for ? 12. Find his gain or
loss percent.
Solution:-
Cost price of 12 lemons = ?25
Then, cost price of 1 lemon = ? (25/12)
Cost price of 5 lemons = (25/12) × 5
= 125/12
= ? 10.42
He sold 5 lemons for = ?12 =Selling price
By comparing SP and CP = SP > CP, so there is a gain
Gain = SP – CP
= 12 – 10.42
= ? 1.58
Gain % = {(gain/CP) × 100}
= {(1.58/10.42) × 100}
= {15800/1042}
= 15.2%
7. The selling price of 12 pens is equal to the cost price of 15 pens. Find the gain percent.
Solution:-
Let the cost price of 1 pen = ? 1
So, cost price of 12 pens = ? 12
From the question,
Selling price of 12 pens = cost price of 15 pens = ? 15
Gain = SP – CP
= 15 -12
= ? 3
Gain % = {(gain/CP) × 100}
= {(3/12) × 100}
= {300/12}
= 25%
8. The selling price of 16 spoons is equal to the cost price of 15 spoons. Find the loss percent.
Solution:-
Let the cost price of 1 spoon = ? 1
So, cost price of 16 pens = ? 16
From the question,
Selling price of 16 spoons = cost price of 15 spoons = ? 15
Loss = (CP) – (SP)
= ? (16 - 15)
= ? 1
Loss % = {(Loss/CP) × 100}
= {(1/16) × 100}
= {100/16}
= 6.25%
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