Question 1206657
So first you take 180,000 and multiply it by .2 for 20% to get 36,000.(How you get .2 is to move the decimal to places to the left.)Then subtract36,000 from 180,000 to get 144,000 . Then you multiply the mortgage rate .0612 by 144,000  to get 8812.8 .you have to add 8812.8 with 144,000 to get 152,812.8 . Then the monthly payment will be 424.48. After 13 years they paid 66,218.88 . After 14 years they paid 71312.64 . The interest for 14 years is 4,364.33 .