The compound interest earned by Sunil on a certain amount at the end of two years at the rate of 10% p.a. was Rs.420. Find the total amount that Sunil got back at the end of two years in the form of principal plus interest earned.  Choose the correct option:	A) Rs.2530	B) Rs.2430	C) Rs.2420	D) Rs.2410	E) Rs.2440
Let the sum be Rs.P   P{ [ 1 + 10/100]2 - 1 } = 420   P(10/100)(2 + 10/100) = 420 [a2 - b2 = (a - b) ( a + b)] P = 420 / (0.1)(2.1) = 2000. Amount =2000+420=Rs.2420 Answer : Rs.2420
<result>C</result>
The compound interest earned by Sunil on a certain amount at the end of two years at the rate of 10% p.a. was Rs.420. Find the total amount that Sunil got back at the end of two years in the form of principal plus interest earned.