A couple who borrow $60,000 for 20 years at 7.2%, compounded monthly, must make monthly payments of $472.41. (a) Find their unpaid balance after 1 year. (Round your answers to the nearest cent.) $ (b) During that first year, how much do they pay towards the principle? (Round your answer to the nearest cent.) $ During that first year, what are their total payments? (Round your answer to the nearest cent.) $ During that first year, how much interest do they pay? (Round your answer to the nearest cent.)