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Question

A man invests Rs. 9600 at 10% per annum compound interest for 3 years. Calculate:
(i) the interest for the first year.
(ii) the amount at the end of the first year.
(iii) the interest for the second year.
(iv) the interest for the third year.


Solution

Principal(P)=Rs. 9600
Rate(R) =10% p.a.
Period(n)=3 years
(i) Interest for the first year= PTR100
=9600×10×1100=Rs.960
(ii) Amount at the end of first year
=P+S.I.= Rs. 9600 +960 =Rs. 10560
(iii) Principal for the second year=Rs. 10560
Interest for the second year= 10560×10×1100
=Rs. 1056
Amount after second year=Rs.10560 + 1056+Rs. 11616
(iii) Principal for the third year=Rs. 11616
Interest for the third year= 11616×10×1100
116.16×10=Rs.1161.60

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