From a question in my Finance book, I have figured the total mortgage and interest on a loan for 30 years. How do I break down the monthly payment to show the monthly mortgage payment into principal and interest only? The total mortgage is $354,549.50 and the interest payment is $2,125.70.

You have secured a loan from your bank for two years to build your home. The terms of the loan are that you will borrow $200,000 now and an additional $100,000 in one year. Interest of 10% APR will be charged on the balance monthly. Since no payments will be made during the 2-year loan, the balance will grow at the 10% compounded rate. At the end of the 2 years, the balance will be converted to a traditional 30-year mortgage at a 6% interest rate. What will you be paying as monthly mortgage payments (principal and interest only)?