$.$ Assuming an interest rate of $7\mathrm{.}37\%,$ compute how much income you will have each month if you save $$688$ each month for the next $31$ years and then use the accumulated money to buy an annuity of equal monthly payments for U$+2$ years $($or$,$ equivalently, an annuity for life when you expect to live for U$+2$ more years$).($U$=12)$