You purchase a car for $18,500. The tax rate is 9% and you make a $2,000 down payment. How much is your principal? Show steps please

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?