What is the compound interest paid on a sum of Rs.700 for the period of 2 years at 10% per annum. Choose the correct choice.
A) 130
B) 620
C) 147
D) 120
E) none of these

Rationale: "solution = interest % for 1 st year = 10 interest % for 2 nd year = 10 + 10 % of 10 = 10 + 10 * 10 / 100 = 11 total % of interest = 10 + 11 = 21 total interest = 21 % 700 = 700 * ( 21 / 100 ) = 147 answer c"
Answer: C