Please help with the questions proceeding number 3

Your success in business thus far has put you in a position to purchase a home for $500,000 located close to the university you attend. You plan to pay a 20% down payment of $100,000 and borrow the remaining $400,000. You need to decide on a mortgage, and realize you can apply the skills you have acquired in the last several chapters to evaluate your choices. To nd the available options, go to wwwbankratecom. Select \"Mortgages,\" then \"Mortgage Rates.\" For location, choose the nearest large city; for mortgage type, choose purchase (not renance). Consider 30-year xed rate mortgages with 20% down, and assume your credit score is the highest possible. Consider all the options by selecting loans with 'fAll points.\" Update rates and sort by ' te\" to nd the loan with the lowest rate (not APR). Record the rate, points, fees, \" R,\" and monthly payment for this loan. Next consider only loans with \"0 points\" and nd the loan with the lowest fees. Again, record the rate, points, fees, \"APR,\" and monthly payment for this loan. First, use the annuity formula or PMT function in Excel to verify the monthly payment for each loan. (Note that to convert the \"Rate\" to a monthly interest rate you must divide by 12. Your result may differ slightly due to rounding.) Next, calculate the actual amount you will receive from each loan after deducting fees. (Note that fees include both closing costs and points which are paid upfront and are calculated as a % of the loan amount.) Using this net amount as the amount you will receive (rather than $400,000), show that the quoted \"APR\" of the loan is the effective IRR of the loan once all fees are included (you may use the Rate function in Excel, or calculate the NPV at the quoted \"APR\"). Compare the loans, assuming you will keep them for 30 years, as follows: 1. Compute the incremental cash flows of the lower rate loan; that is, determine how much more you will pay in fees, and how much you will save on your monthly payment. 2. What is the payback period of the lower rate loan? That is, how many years of lower monthly payments will it take to save an amount equal to the higher fees? 3. What is the IRR associated with paying the higher fees for the lower rate loan? (Again, the RATE function can be used.) 4. Plot the NPV profile of the decision to pay points for the lower rate loan. Do the NPV rule and the IRR rule coincide? Next, compare the loans assuming you expect to keep them for only 5 years: 5. Compute the nal payment you will need to make to pay off each loan at the end of 5 years (Hint: the FV function in Excel can be used). Which loan will be more expensive to repay? 6. Including the incremental cost to repay the loan after 5 years, what is the IR and NPV prole associated with paying points now? Create a data table showing the NPV of paying points for different horizons (1 to 30 years) and different discomt rates (0% to the IRR in (3) above). What can you conclude about whether it is a good idea to pay points? Suppose the bank gives you the option to increase either loan amount so that for either loan, you will receive $400,000 today after all fees and points are paid. How would this affect your decision to pay points