I'm not sure how to do this.

Prepare an amortization schedule for a three-year loan of $90,000. The interest rate is 11 percent per year, and the loan agreement calls for a principal reduction of $30,000 every year. How much total interest is paid over the life of the loan? (Enter rounded answers as directed, but do not use rounded numbers in intermediate calculations. Leave no cells blank. You must enter 'O' for the answer to grade correctly.)