Dimond 7 has been operating an excavation company in British Columbia for the last 20 years. The company has been successful in generating revenue and free cash flows (FCF). The company is planning to replace 7 excavators. The supplier will trade in old excavators and will deduct $95,000 from the total purchase price of new excavators. Each new excavator will cost $175,000.

The corporate tax rate is 35%. The company beta (b_A) is 1.45, risk-free return (R_f) is 0.65%, and the expected rate of return on market portfolio is 7%. Based on the risk, the bank will charge 6.35% on the commercial loans/chattel mortgages granted for excavators. The company will use 60% equity financing and 40% debt financing.

Based on the above information, please calculate the WACC. Please show all the calculations by which you came up with the final answer. (3 Points)

b) Another excavation company called Diamond 12 has 50,000 shares of common stock outstanding with a market price of $50 per share. It has 1,500 bonds outstanding, each selling for $1,350. The bonds mature in 15 years, have a coupon rate of 6.85%, and pay coupons annually. The firm's beta is 0.73, the risk-free rate is 0.65%, and the expected rate of return on market portfolio is 6%. The tax rate is 34%.

Based on the above information, please calculate the WACC. Please show all the calculations by which you came up with the final answer. (3 Points)