5. Calculating Monthly Mortgage Payments. Based on Exhibit 9-9. or using a financial calculator, what would be the monthly mortgage payments for each of the following situations? a. $120,000,15-year loan at 4.5 percent. b. $86,000,30-year loan at 5 percent. c. $105,000,20-year loan at 6 percent, d. What relationship exists belween the length of the loan and the monthly payment? How does the mortgage rate affect the monthly payment