Jack and Jill need to save $$6200$ toward a new car. How long will it take them if they save $$220$ a month earning an annual interest of $4\mathrm{.}5\%($compounded monthly$)?($Treat as an ordinary annuity.$)($State your answer in years rounded to the second decimal place, e$.$g$.,12\mathrm{.}34)$

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