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Simple Interest - General Aptitude

Q1:

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?

A 3.5 years

B 4 years

C 4.5 years

D 5 years

ANS:B - 4 years

Time = 100 x 81 years = 4 years.
450 x 4.5