Simple interest on a certain sum at a certain annual rate of interest is 1/9 of the sum. If the numbers representing rate percent and time in years be equal, then the rate of interest is:

5

8

3 1/3

2 2/3

Let sum = x. Then, S.I. = x/9 Let rate = R% and time = R years. [x * R * R / 100] = x / 9 ? R^2 = 100/9 R = 10/3 = 3 1/3. Hence, time = 3 1/3 %.

At what rate of annual interest,a certain sum will amounr to four times in 15 year?

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