How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
Choices:
A) 3.5 years  B) 4 years  C) 4.5 years  D) 5 years  E) 5.5 years
Time = (100 x 81)/(450 x 4.5) = 4 years.   Answer: Option 4 years
<result>B</result>
How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?