What will be the difference between simple and compound interest @10% per annum on a sum of $1000 after 4 years?	Choose the correct choice from the following answers.
A) $ 48.12	B) $ 52.64	C) $ 64.10	D) $ 72.85	E) $ 60.10

Rationale: "s . i . = 1000 * 10 * 4 / 100 = $ 400 c . i . = 1000 * ( 1 + 10 / 100 ) ^ 4 - 1000 = $ 464.10 difference = 464.10 - 400 = $ 64.10 answer is c"
Answer: C