K An ordinary annuity pays $7\mathrm{.}68\%$ compounded monthly $($A$)$ A person deposits $$100$ monthly for $30$ years and then makes equal monthly withdrawals for the next $15$ years, reducing the balance to zero. What are the monthly withdrawals? How much interest is eamed during the entire $45-$year process?

$(8)$ If the person wants to make withdrawals of $2,500$ per month for the last $15$ years, how much must be deposited monthly for the first $30$ years?

$($A$)$ The monthly withdrawals are $ all parts

$($Round to the nearest cent as needed$)$