Some amount of money is invested in an account at $r$ percent compound interest rate, the amount of investment will do

Some amount of money is invested in an account at $r$ percent compound interest rate, the amount of investment will double in $\dfrac{70}{r}$ years. If the amount gets $4$ times in $n$ years, is $n < 10?$

(1) $r < 14\%$
(2) $r > 12\%$

Answer: A

Source: e-GMAT

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