A sum of Rs.4700 is invested at a compound interest for three years, the rate of interest being 10% p.a., 20% p.a. and 25% p.a. for the 1st, 2nd and the 3rd years respectively. Find the interest received at the end of the three years.
Choices:
A) Rs.2520
B) Rs.3055
C) Rs.3320
D) Rs.2760
E) None of these
Let A be the amount received at the end of the three years.   A = 4700[1 + 10/100][1 + 20/100][1 + 25/100]   A = (4700 * 11 * 6 * 5)/(10 * 5 * 4)   A = Rs.7755   So the interest = 7755 - 4700 = Rs.3055   ANSWER:Rs.3055
<result>B</result>
A sum of Rs.4700 is invested at a compound interest for three years, the rate of interest being 10% p.a., 20% p.a. and 25% p.a. for the 1st, 2nd and the 3rd years respectively. Find the interest received at the end of the three years.