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? Options:
A) 8 years
B) 4 years
C) 7 years
D) 6 years
E) 2 years
Explanation:   Time = (100 x 81)/(450 x 4.5) 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?