The difference between the compound interest and simple interest on a certain sum of money at 5% per annum for 2 years is 45. Then the original sum is?  Choose the correct option
A) Rs.16500/-
B) Rs.17000/-
C) Rs.18000/-
D) Rs.19000/-
E) Rs.20000/-
For 2 years = (1002D)/R2   = (1002 × 45)/(5 × 5) = (10000 × 45)/25 = Rs.18000/-   Rs.18000/-
<result>C</result>
The difference between the compound interest and simple interest on a certain sum of money at 5% per annum for 2 years is 45. Then the original sum is?