What will be the difference between simple interest and compound interest @10% per annum on a sum of Rs. 1000 after 4 years? Choose the most appropriate option:
A) Rs. 31
B) Rs. 32.10
C) Rs. 40.40
D) Rs. 64.10
E) None
Solution   S.I.	=Rs(1000x10x4 / 100)   = Rs.400.   C.I.	=Rs.[1000x(1x10/100)4-1000]   = Rs. 464.10   ∴ Difference = Rs.(464.10 - 400)   = Rs. 64.10   Answer Rs. 64.10
<result>D</result>
What will be the difference between simple interest and compound interest @10% per annum on a sum of Rs. 1000 after 4 years?