How much time will it take for an amount of 450 to yield 81 as interest at 4.5% per annum of simple interest? Choose the correct answer:
A) 3.5 years  B) 4 years  C) 4.5 years  D) 5 years  E) None
Explanation: Time = (100 x 81)/(450 x 4.5) years = 4 years.   Answer: Option 4 years
<result>B</result>
How much time will it take for an amount of 450 to yield 81 as interest at 4.5% per annum of simple interest?