Problem 7-8 Calculating Monthly Mortgage Payments [LO3] 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 $64,000, 15-year loan at 7.0 percent APR compounded semi-annually b) A $140,000, 25-year loan at 5.5 percent APR compounded semi-annually A $104,000, 20-year loan at 4.0 percent APR compounded semi-annually c) $ $ $