a$.$ Andrea wants to know how much money she will have in $6$ years if she deposits her $$900$ tax refund now and then deposits an additional $$60$ per month in her account that pays an APR of $1\mathrm{.}5\%$ compounded monthly. Use Excel to determine how much money will Andrea have in the account in $6$ years?

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b$.$ If Andrea changes her mind and decides that instead of setting aside $$60$ per month she wants to know how much she will have to deposit each month to save up a total of $$7500,$ we can use goal seek to find the value for PMT which yields $$7500$ at the end of $6$ years. How much money will Andrea need to deposit per month?