A $105,000 mortgage loan has a 25-year amortization. a. Calculate the monthly payment at interest rates of 5%, 7%, and 9% compounded semiannually. (Do not round intermediate calculations and round your final answers to 2 decimal places.) Interest rate Monthly payment 58 78 98 $ es es es $ b. By what percentage does the monthly payment on the 9% mortgage exceed the monthly payment on the 5% mortgage? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Percent difference % c. Calculate the total interest paid over the entire 25-year amortization period at each of the three interest rates. (Assume the final payment equals the others.) (Do not round intermediate calculations and round your final answers to the nearest whole dollar amount.) Interest rate 58 78 98 Total interest paid $ es es