At what rate of interest per annum will a sum double itself in 8 years

1.	At what rate of interest per annum will a sum double itself in 8 years?
A.	25%
B.	\[6\frac{1}{4}%\]
C.	\[12\frac{1}{2}%\]
D.	\[3\frac{2}{5}%\]
Answer» D. \[3\frac{2}{5}%\]

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At what rate of interest per annum will a sum double itself in 8 years?

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