this is the question and answer please explan how they got the answers

3. Eastern Digital has 300,000 shares outstanding which sell for $10 per share. The extra risk associated with this stock suggests that the investor should get a return 5% greater than that being paid on its bonds. The company has 10,000 10-year bonds outstanding. The bonds have a coupon rate of 8% (coupons paid semiannually), a face value of $1,000 and currently sell for $1,100. The marginal tax rate for this company is 30%. What is this company's WACC? 4. (continued from question 3) Eastern Digital is planning on expanding its operations. Its initial outlay would be $12m. The project would generate $2m per year over the next 10 years (starting at the beginning of next year). Is this project worthwhile? 3. n: 20, i: 3.31, pv: -1,100, ptm: 40, fv: 1,000; yield = 6.62, cost of debt = 6.62*0.7 = 4.63 Cost of equity = 11.62; weights on equity and debt calculated at market prices. Cost of capital = 0.79*4.63 +0.21*11.62 = 6.10 4. n: 10,i: 6.10, pv: 14.65, ptm: 2, fv: 0; NPV = 14.65 - 12 = 2.65; project is worth doing