What will be the compound interest on a sum of Rs. 40,000 after 3 years at the rate of 12% p.a.?
Choose one:  A) s : 10123.19  B) s : 10123.29  C) s : 10123.20  D) s : 10123.28  E) s : 16197.12

Rationale: "amount = [ 40000 * ( 1 + 12 / 100 ) 3 ] = 40000 * 28 / 25 * 28 / 25 * 28 / 25 = rs . 56197.12 c . i . = ( 56197.12 - 40000 ) = rs : 16197.12 answer : e"
Answer: E