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 ?	Select:	A) 3.5 years	B) 4 years	C) 4.5 years	D) 5 years	E) None
Solution   Time = (100x81/450x45)years = 4 years.   Answer 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 ?