Answer:
1. Which firm has a greater FCF (free cash flow)?
2. What is firm A’s (annual) tax shield?
3. What is firm B’s (annual) tax shield?
Explanation:
since firm A's debt is $20, its value is $100, then its equity = $80
since firm B's debt is $80, its value is $100, then its equity = $20
Firm A's cash flow = (EBIT - interest expense) x (1 - tax rate) = [$10 - ($20 x 10%)] x 0.6 = $4.80
Firm B's cash flow = (EBIT - interest expense) x (1 - tax rate) = [$10 - ($80 x 10%)] x 0.6 = $1.20
Firm A's annual tax shield = taxable interest x tax rate = ($20 x 10%) x 40% = $0.80
Firm B's annual tax shield = taxable interest x tax rate = ($80 x 10%) x 40% = $3.20