A sum of Rs.4600 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. Options:
A) Rs.2990
B) Rs.3120
C) Rs.3320
D) Rs.2760
E) None of these
Let A be the amount received at the end of the three years.   Rs.2990 = 4600[1 + 10/100][1 + 20/100][1 + 25/100]   Rs.2990 = (4600 * 11 * 6 * 5)/(10 * 5 * 4)   Rs.2990 = Rs.7590   So the interest = 7590 - 4600 = Rs.2990   Rs.2990NSWER:Rs.2990
<result>A</result>
A sum of Rs.4600 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.