A reduction of 20% in the price of sugar enables a housewife to purcha...
Explanation:
Reduction in price = 1/5 = 20%
Increase in Quantity = 25%
25% = 6 Kg.
original amount of Sugar = 6*4 = 24Kg.
Original price of the sugar = 240/24 = Rs. 10 per kg.
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A reduction of 20% in the price of sugar enables a housewife to purcha...
Given:
- Reduction of 20% in the price of sugar
- Housewife can purchase 6 kg more for Rs. 240
To find:
- Original price per kg of sugar
Solution:
Let the original price of sugar be x Rs/kg.
After the reduction of 20%, the new price of sugar = (100-20)% of x = 80% of x = 0.8x Rs/kg.
Let the quantity of sugar that the housewife could purchase before the reduction be y kg.
Then, the total cost of y kg of sugar before the reduction = xy Rs.
After the reduction, the housewife can purchase 6 kg more for the same amount of money, i.e. Rs. 240.
So, the new quantity of sugar that the housewife can purchase = y + 6 kg.
The total cost of (y+6) kg of sugar after the reduction = xy Rs.
But we know that this cost is equal to Rs. 240.
So, we have the equation:
xy = 240
Now, let's find the value of y in terms of x.
Before the reduction, the housewife could purchase y kg of sugar for xy Rs.
After the reduction, for the same amount of money, the housewife can purchase (y+6) kg of sugar.
So, we have the equation:
(y+6) * 0.8x = xy
Simplifying this equation, we get:
0.8xy + 4.8x = xy
0.2xy = 4.8x
y = 24/x
Now, substituting the value of y in the equation xy = 240, we get:
x * 24/x = 240
24 = 10x
x = 24/10 = 2.4
Therefore, the original price of sugar was Rs. 2.4 per kg.
But the options given in the question are in whole numbers, so we need to convert this answer to Rs/kg.
Multiplying both sides by 10 gives:
x = 24/10 = 2.4
10x = 24
So, the original price of sugar was Rs. 24 per 10 kg, or Rs. 2.4 per kg.
Hence, the correct option is (a) Rs. 10 per kg.
A reduction of 20% in the price of sugar enables a housewife to purcha...
Shortcut:
Step1: 20×(240/100) => Rs 48 for 6Kg => 48/6, => Rs 8/Kg New Rate,
Step2: 8×(100/80) => Rs 10/Kg Original Rate
Therefore In This Question NEW RATE IS RS 8 PER Kg
And ORIGINAL RATE IS RS 10 PER Kg