A couple who borrow $70,000 for 15 years at 6%, compounded monthly, must make monthly payments of $590.70. (a) Find their unpaid balance after 1 year. (Round your answers to the nearest cant.) $ 67030 (b) During that first year, how much do they pay towards the principle? (Round your answer to the nearest cont.) $4119.26 During that first year, what are their total payments? (Round your answer to the nearest cent.) 5 During that first year, how much interest do they pay? (Round your answer to the nearest cent.)