How much time will take for an amount of Rs. 100 to yield Rs. 81 as interest at 4.5% per annum of simple interest? Choices.
A) 7	B) 4	C) 18	D) 10	E) 15
Time = (100 * 81) / (100 * 4.5) = 4 years'   Answer:18
<result>C</result>
How much time will take for an amount of Rs. 100 to yield Rs. 81 as interest at 4.5% per annum of simple interest?