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

[VJesus12]

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