How much time will take for an amount of Rs. 400 to yield Rs. 81 as interest at 4.5% per annum of simple interest?  Choose the correct answer.
A) 4 1/2 years  B) 6 1/2years  C) 7 1/2years  D) 12 1/2years  E) 15 1/2years
Time = (100 * 81) / (400 * 4.5) = 4 1/2years   4 1/2 yearsNSWER:4 1/2 years
<result>A</result>
How much time will take for an amount of Rs. 400 to yield Rs. 81 as interest at 4.5% per annum of simple interest?