Use PMT =[1(1+nr)nt]P(nr) to determine the regular payment amount, rounded to the The buyer is offered two mortgage options: 20 -year fixed at 7% or 30 -year fixed at 7%. Calculate the amount of interest paid for each option. How much does the buyer save in interest with the 20 -year option? Find the monthly payment for the 20 -year option. $ (Round to the nearest dollar as needed.) Find the monthly payment for the 30-year option. $ (Round to the nearest dollar as needed.) Calculate the total cost of interest for both mortgage options. How much does the buyer save in interest with the 20 -year option? $ (Use the answers from parts 1 and 2 to find this answer.)