You borrow a GPM of $450,000 with annual payments and 15-year term. The interest rate is 3.5% and the payment factors from year 1 to year 15 are: 50%, 50%, 50%, 50%, 50%, 75%, 75%, 75%, 75%, 75%, 100%, ..., 100%.

Questions:

1. What are the annual payments for years 1 to 15?
2. What is remaining balance at the end of each year?
3. What are the interest payment and principal payment for years 1 to 15?