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Part $1$

If a investment advisor promises to double your money every $71/2$ years,$$ you're being promised an annual return of approximately$\_\_\_\_\_\%$; and if the annual return you actually earn is$5\mathrm{.}25\%,$ then it would take approximately$\_\_\_\_\_$ years for your initial investment to double.

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Part $1$

A$.$

$9\mathrm{.}60\%$; $13\mathrm{.}71$ years

B$.$

$10\mathrm{.}42\%$; $7\mathrm{.}29$ years

C$.$

$7\mathrm{.}29\%$; $10\mathrm{.}42$ years

D$.$

$13\mathrm{.}71\%$; $9\mathrm{.}60$ years