8. The Steins buy a house and take out an $85000 mortgage. The mortgage is amortized over 25 years at i(2-9%. After 3 years, the Steins sell their house and the buyer wants to set up a new mortgage better tailored to his needs. The Steins find out that in addition to repaying the principal balance on their mortgage, they must pay a penalty equal to three months' interest on the outstanding balance. What total amount must they repay