At six months’ intervals A deposited of Rs. 1000 in a savings account ...
Calculation of Interest
First, we need to calculate the interest earned on each deposit. The interest rate is 10% p.a., compounded semi-annually. Therefore, the interest rate for each 6-month period is:
r = 10/2 = 5%
For the first deposit, the money remained in the account for 9.5 years (from 6 months old to 10 years old). Therefore, the interest earned on the first deposit is:
I1 = 1000*(1+r)^19 - 1000 = 1000*(1.05)^19 - 1000 = 3094.96
For the second deposit, the money remained in the account for 9 years. Therefore, the interest earned on the second deposit is:
I2 = 1000*(1+r)^18 - 1000 = 1000*(1.05)^18 - 1000 = 2848.24
For the third deposit, the money remained in the account for 8.5 years. Therefore, the interest earned on the third deposit is:
I3 = 1000*(1+r)^17 - 1000 = 1000*(1.05)^17 - 1000 = 2625.51
For the fourth deposit, the money remained in the account for 8 years. Therefore, the interest earned on the fourth deposit is:
I4 = 1000*(1+r)^16 - 1000 = 1000*(1.05)^16 - 1000 = 2422.40
For the fifth deposit, the money remained in the account for 7.5 years. Therefore, the interest earned on the fifth deposit is:
I5 = 1000*(1+r)^15 - 1000 = 1000*(1.05)^15 - 1000 = 2237.19
For the sixth deposit, the money remained in the account for 7 years. Therefore, the interest earned on the sixth deposit is:
I6 = 1000*(1+r)^14 - 1000 = 1000*(1.05)^14 - 1000 = 2068.39
For the seventh deposit, the money remained in the account for 6.5 years. Therefore, the interest earned on the seventh deposit is:
I7 = 1000*(1+r)^13 - 1000 = 1000*(1.05)^13 - 1000 = 1914.94
For the eighth deposit, the money remained in the account for 6 years. Therefore, the interest earned on the eighth deposit is:
I8 = 1000*(1+r)^12 - 1000 = 1000*(1.05)^12 - 1000 = 1775.17
For the ninth deposit, the money remained in the account for 5.5 years. Therefore, the interest earned on the ninth deposit is:
I9 = 1000*(1+r)^11 - 1000 = 1000*(1.05)^11 - 1000 = 1648.64
For the tenth deposit, the money remained in the account for 5 years. Therefore, the interest earned on the tenth deposit is:
I10 = 1000*(1+r)^10 - 1000 = 1000*(1.05)^10 - 100
At six months’ intervals A deposited of Rs. 1000 in a savings account ...
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