please explain without using excel, thanks

7. For a company, you are given (i)Unlevered cost of capital 8% Cost of equity capital 20% Cost of debt capital 5% (ii) Free cash flows are 2 million this year, and grow 4% per year. (iii) The company maintains a constant debt-equity ratio. (iv) The corporate tax rate is 21%. Calculate the present value of the interest tax shield. 7. For a company, you are given (i)Unlevered cost of capital 8% Cost of equity capital 20% Cost of debt capital 5% (ii) Free cash flows are 2 million this year, and grow 4% per year. (iii) The company maintains a constant debt-equity ratio. (iv) The corporate tax rate is 21%. Calculate the present value of the interest tax shield