Most homebuyers have the choice of a 15-year mortgage or a 30 year mortgage. Calculate the difference in payments on a 30-year mortgage at current interest rates located on Yahoo! Finance versus a 15-year mortgage at current interest rates. Assume that both mortgages are for $800,000 and have monthly payments. What is the difference in total dollars that will be paid to the lender under each loan? What if interest rates on both lengths of loans increase by four (4) percentage points? [15 points]