7) The Martinez's are planning to refinance their home. The outstanding balance on their original mortgage is $150,000. Their finance company has offered them two options: Option A: A fixed-rate mortgage at an interest rate of 4.25% per year compounded monthly, payable over 30-years. Option B: A fixed-rate mortgage at an interest rate of 4.0% per year compounded monthly, payable over 15-years. a) Find the monthly payment required to pay off the 30-year loan. b) Find the monthly payment required to pay off the 15-year loan. c) How much interest would be saved if the 15-year mortgage is chosen instead of the 30-year mortgage