If the simple interest on a sum of money for 2 years at 5% per annum is $50, what is the compound interest on the same at the same rate and for the same time? Choose the correct answer:
A) $50  B) $51.5  C) $52  D) $52.5  E) $51.25
Sum = 50 x 100 /(2 x 5) = 500   = 500 x (1 +	5/100)^2   = 500 x 21/20 x 21/20   = 551.25.   C.I = 551.25 - 500 = 51.25.   Answer $51.25)$51.25
<result>E</result>
If the simple interest on a sum of money for 2 years at 5% per annum is $50, what is the compound interest on the same at the same rate and for the same time?