Discussion of Question with ID = 022 under Simple-Interest

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Question

The interest on a certain principal sum is 4/81 times the sum. What is R, the rate of interest, if the time is R years?

A

$2{2/9}$%.

B

$2{1/3}$%.

C

$2{4/9}$%.

D

$2{1/9}$%.

Soln.
Ans: a

I = P × (4/81), so we can write P × (4/81) = P × (R/100) × R. Cancelling P and solving for R, we get, R = $√{100 × 4/81}$ = $2{2/9}$%.


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