Based on Exhibit $7-7,$ or use of a financial calculator, what would be the monthly mortgage payments for each of the following

situations? $($ longleftrightarrow LO$7\mathrm{.}3)$

a$.$ A $$160,000,15-$year loan at $5\mathrm{.}5$ percent.

b$.$ A $$215,000,30-$year loan at $6$ percent.

c$.$ A $$190,000,20-$year loan at $6\mathrm{.}5$ percent.