I was able to figure out the first portion but I am having trouble figuring out the second.

You borrow $150,000 to purchase a new house. The bank offers you a special 20 year loan with a 7% interest rate and you will make annual payments. How large will each payment be? If you want to sell your house after 7 years, how much will you owe and need to pay to pay off the loan? Solution: $14,158.94 and $118,335.47