Jack loaned his sister $25,000 to be used as a down payment for her new home and she is to pay him back in a lump sum in 3 years with 10% interest. How much will she have to repay him at the end of the 3 years? Lucy obtained a $375,000 mortgage loan for 30 years and her monthly payment is 1,250. How much interest is she paying for the loan? Sam and Olivia just got married and plan to use $30,000 that they received as wedding gifts as a down payment for a new home. The house that they want costs $425,000. They were able to secure a 30-year fixed rate mortgage at a 4.50% interest rate. What is the monthly mortgage payment on their new home?