This problem is a complex financial problem that requires several skills, perhaps some from previous sections. (a) Find their regular monthly payment. (Round your answer to the nearest cent.) $ (b) Find the unpaid balance when they begin paying the $1200. (Round your answer to the nearest cent.) $ (c) How many payments of $1200 will it take to pay off the loan? Give the answer correct to two decimal places. monthly payments (d) Use your answer to part (c) to find how much interest they save by paying the loan this way. (Round your answer to the nearest cent.) $