You purchase a boat for $350,000 and pay $50,000 down. You also agree to pay the rest over the next 15 years in monthly payments plus 4.5 percent interest on the unpaid balance. What will be the amount of each payment? Note: format is $X,XXX.XX You purchase a boat for $350,000 and pay $50,000 down. You also agree to pay the rest over the next 15 years in monthly payments plus 4.5 percent interest on the unpaid balance. What will be the amount of each payment? Note: format is $X,XXX.XX