Question

14. A sum of 4,800 is invested at compound interest for
three years, the rate of interest being 10% p.a.,
20% p.a. and 25% p.a. for 1st, 2nd and 3rd years
respectively. The interest received at the end of
3 years is
(*)
21
ممال
at compound interest​

Answer 1

Answer:

Rs.2520

B. Rs.3120

C. Rs.3320

D. Rs.2760

E. None of these

Explanation:

Let A be the amount received at the end of the three years.

A = 4800[1 + 10/100][1 + 20/100][1 + 25/100]

A = (4800 * 11 * 6 * 5)/(10 * 5 * 4)

A = Rs.7920

So the interest = 7920 – 4800 = Rs.3120

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