I want to know how to calculate the pribcipal Repayment by formula.

3. Consider the project below and figure the after tax cash flows for each year of the project. 0 1 140,000 12,000 20% 2 140,000 8,231 32% 3 140,000 4,235 19.2% 140,000 0 11.52% Income Statement End of Year Savings Debt Interest Depreciation % Depreciation Taxable income Income Taxes Net Income Cash Flow Statement Net Income Depreciation Machine Salvage Value Gains Tax Borrowed Funds Principal Repayment Net Cash Flow 300,000 100,000 200,000 62,822