Question 1. Ten years ago Sarah purchased her house and took out a mortgage for $400,000. The term of the mortgage was 15- years with monthly payments at a fixed interest rate of 3.5%. She is selling the house and will use a portion of her proceeds to pay off the mortgage. What is the principal balance on the mortgage that must be paid off? How much total interest has been paid by Sarah over the past 10 years? Question 1. Ten years ago Sarah purchased her house and took out a mortgage for $400,000. The term of the mortgage was 15- years with monthly payments at a fixed interest rate of 3.5%. She is selling the house and will use a portion of her proceeds to pay off the mortgage. What is the principal balance on the mortgage that must be paid off? How much total interest has been paid by Sarah over the past 10 years