1.

The rate of simple interest per annum to be taken, so that an amount becomes four times to its principal in 21 years is:

A. \(14\frac{4}{7}\)%
B. \(14\frac{3}{7}\)%
C. \(14\frac{2}{7}\)%
D. \(14\frac{1}{7}\)%
Answer» D. \(14\frac{1}{7}\)%


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