please show answers in excel and how to do the formula in excel too

P11-24 of capital, r, is Risk-adjusted discount rates: Basic Country Wallpapers is considering investin one of three mutually exclusive projects, E, F, and G. The firm's cost of capit 15%, and the risk-free rate, Rr, is 10%. The firm has gathered the basic cas and risk index data for each project as shown in the following table. red the basic cash flow G - $19,000 Initial investment (CF.) Year (t) Project (1) E F - $15,000 - $11,000 Cash inflows (CF) $6,000 $6,000 6,000 4,000 6,000 5,000 6,000 2,000 1.80 1.00 $ 4,000 6,000 8,000 12,000 0.60 w - Risk index (RI) a. Find the net present value (NPV) of each project, using the firm's cost of capital. Which project is preferred in this situation? b. The firm uses the following equation to determine the risk-adjusted discount rate, RADR, for each project j: RADR, = Rp + [RI, X (r - Rp)] where Rp = risk-free rate of return RI, = risk index for project r = cost of capital Substitute each project's risk index into this equation to determine its RADR