Leo wants to have $$1\mathrm{.}5$ million in his retirement account. If he feels he can earn an APR of $7\mathrm{.}5$ percent compounded monthly and plans to save $$225$ per month until he reaches his goal, how many years will it be until he reaches his goal and retires? $($Round your answer to two decimal places l$.$e$.12\mathrm{.}34$ years $-$ do not type years in your answer$)$

Numeric Response