$8.$ Yumi's grandparents presented her with a gift of $$18,000$ when she was $9$ years old to be used for her college education. Over the next $8$ years, until she turned $17,$ Yumi's parents had invested her money in a tax$-$free account that had yielded interest at the rate of $3\mathrm{.}5\%/$year compounded monthly. Upon turning $17,$ Yumi now plans to withdraw her funds in equal annual installments over the next $4$ years, starting at age $18.$ If the college fund is expected to earn interest at the rate of $4\%/$year$,$ compounded annually, what will be the size of each installment? $($Assume no interest is accrued from the point she turns $17$ until she makes the first withdrawal. Round your answer to the nearest cent.$)$$ $9.$Jennifer is the owner of a video game and entertainment software retail store. She is currently planning to retire in $30$ years and wishes to withdraw $$12,000/$month for $20$ years from her retirement account starting at that time. How much must she contribute each month for $30$ years into a retirement account earning interest at the rate of $4\%/$year compounded monthly to meet her retirement goal? $($Round your answer to the nearest cent.$)$ Just need these two answers work is optional