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:
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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