I'm stuck in questions 8 and 9, from chapter 5 in the financial planning exercises.

Calculating monthly mortgage payments. Find the monthly mortgage payments on the follow ing mortgage loans using either your calculator or the table in Exhibit 5.8 a. $80,000 at 6.5 percent for 30 years b. $105,000 at 5.5 percent for 20 years c. $95,000 at 5 percent for 15 yeas LG4, p. 184 8. Home affordability analysis. Use Worksheet 5.3. Selma and Rodney Jackson need to calculate the amount that they can afford to spend on their first home. They have a combined annual income of $47,500 and have $27,000 available for a down payment and closing costs. The Jacksons esti- mate that homeowner's insurance and property taxes will be $250 per month. They expect the mortgage lender to use a 30 percent (of monthly gross income) mortgage payment affordability ratio, to lend at an interest rate of 6 percent on a 30-year mortgage, and to require a 15 percent down payment. Based on this information, use the home affordability analysis form in Worksheet 5.3 to determine the highest-priced home that the Jadksons can afford LG4, p. 184 9