What will be the difference between simple and compound interest at 10% per annum on a sum of Rs. 1000 after 4 years?  Choose the correct option
A) 64.98
B) 64.29
C) 53.98
D) 64.1
E) 22.13
n:   S.I. = (1000 * 10 * 4)/100 = Rs. 400   C.I. = [1000 * (1 + 10/100)4 - 1000]   = Rs. 464.10 Difference   = (464.10 - 400)   = Rs. 64.10   Answer:64.1
<result>D</result>
What will be the difference between simple and compound interest at 10% per annum on a sum of Rs. 1000 after 4 years?