$5.)$ The Fiore$$s wish to create a sinking fund to save for their children$$s education.

a$.)$ They estimate that they will need to save about $$150,000$ in $18$ years. If the

account returns $7\mathrm{.}5\%,$ how much are the monthly installments?

b$.)$ How much will The Fiore$$s deposit in the account?c$.)$ Once in college, what are the monthly installments of the $$150,000$ pay out in

$4$ years?

d$.)$ What is the total amount the twins will receive from the $$150,000$ pay out

during the $4$ years they$$re in college.