A sum of Rs.2000 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.
Choose the correct choice from the following answers:	A) 2888	B) 3120	C) 2877	D) 2999	E) 1300
Let A be the amount received at the end of the three years.   A = 2000[1 + 10/100][1 + 20/100][1 + 25/100]   A = (2000 * 11 * 6 * 5)/(10 * 5 * 4)   A = Rs.3300   So the interest = 3300 - 2000 = Rs.1300   Answer: 1300
<result>E</result>
A sum of Rs.2000 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.