A sum of Rs.3000 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. Select: A) 2888 B) 3120 C) 2877 D) 2999 E) 1950
Let A be the amount received at the end of the three years.   A = 3000[1 + 10/100][1 + 20/100][1 + 25/100]   A = (3000 * 11 * 6 * 5)/(10 * 5 * 4)   A = Rs.4950   So the interest = 4950 - 3000 = Rs.1950   Answer: 1950
<result>E</result>
A sum of Rs.3000 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.