How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest

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Question: 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 are:

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

Correct answer is:

B.     4 years