Based on Exhibit $7-8,$ what would be the monthly mortgage payments for each of the following situations? $($Round mortgage payment

factors and final answers to $2$ decimal places. Omit the $"$$$"$ sign in your response.$)$

a$)$ A $$123,000,15-$year loan at $6\mathrm{.}0$ percent APR compounded semi$-$annually

b$)$ A $$165,000,25-$year loan at $7\mathrm{.}5$ percent APR compounded semi$-$annually

c$)$ A $$68,000,20-$year loan at $7\mathrm{.}5$ percent APR compounded semi$-$annually