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?

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A.  3.5 years
B.  4 years
C.  4.5 years
D.  5 years
Ans: B

Explanation: 

Time = (100×81/ 450×4.5)years
        = 4 years.

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