$1$a$)$ Penny wants to have $$300,000$ in an investment account after twenty$-$five years of savings. The account will

pay $0\mathrm{.}18$ percent interest per week. If she deposits the same amount at the end of each week, how much will

each deposit have to be for her to reach her goal?

$1$b$)$ You want to purchase a new condominium that costs $$400,000.$ Your plan is to pay $15$ percent down in cash

and finance the balance over $30$ years at a $6\mathrm{.}75$ percent APR. What will your monthly mortgage payment be$?$