c$)$ Mr$.$ G has $$15,000$ to invest. He is undecided about putting the money into tax$-$exempt municipal bonds paying $3\mathrm{.}5$ percent annual interest or corporate bonds paying $4\mathrm{.}75$ percent annual interest. The two investments have the same risk. $1)$ Which investment should Mr$.$ G make if his marginal tax rate is $32$ percent? $2)$ Would your conclusion change if Mr$.$ G$$s marginal tax rate is only $12$ percent?