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Question

Arif took a loan of Rs. 80,000 from a bank. If the rate of interest is 10% p.a., find the difference in amounts he would be paying after 112 years if the interest is (i) compounded annually and (ii) compounded half-yearly.

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Solution

1) Compounded Annually :
P=Rs.80000
R=10% p.a.
T=112 years n=1+12
Amount for 1st year.
A=P[1+R100]n
=Rs.80000[1+10100]=Rs.88000
SI on Rs. 88000 for next 1/2 year
=Rs.88000×10100×12=Rs.4400
Therefore, Amount = Rs.88000+Rs.4400 = 92400Rs.

2) Compounded half yearly :
P=Rs.80000
R=10% p.a.=5% per half year
T=112 years n=3
A=Rs.80000[1+5100]3
A=Rs.92610
Thus, the difference between the two amounts = Rs.92610Rs.92400 =Rs.210

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