The Martinezes are planning to refinance their home. The outstanding balance on their original loan is $100,000. Their finance company has offered them two options. (Assume there are no additional finance charges. Round your answers to the nearest cent.) Option A: A fixed-rate mortgage at an interest rate of 4.5%/year compounded monthly, payable over a 25-year period in 300 equal monthly installments. Option B: A fixed-rate mortgage at an interest rate of 4.25%/year compounded monthly, payable over a 15-year period in 180 equal monthly installments. (a) Find the monthly payment required to amortize each of these loans over the life of the loan. option A $ option B $ (b) How much interest would the Martinezes save if they chose the 15-year mortgage instead of the 25-year mortgage? $