At the end оf t yeаrs, the future vаlue оf аn investment оf $9000 in an account that pays 10(%) APR compounded monthly is (s=9000left(1+frac{0.1}{12}right)^{12t}) dollars. Assuming no withdrawals or additional deposits, how long will it take for the investment to reach $27,000? Round to three decimal places.