Answer and Explanation:
The computation is shown below:
For Current
Total assets = Debt + Equity
= 2 + 7 9
Now
Debt ratio = Debt ÷ Total assets = 2 ÷ 9
Equity ratio = Equity ÷ Total assets = 7 ÷ 9
Return on assets = Cost of debt × Debt ratio + Cost of equity × Equity ratio
11% = 9% × 2 ÷ 9 + Cost of equity × 7 ÷ 9
Cost of equity × 7 ÷ 9 = 11% - (9% × 2 ÷ 9)
Cost of equity = ( 11% - (9% × 2 ÷ 9) ) × 9 ÷ 7
= 12%
For New
Total assets = Debt + Equity = 7 + 2 = 9
Debt ratio = Debt ÷ Total assets = 7 ÷ 9
Equity ratio = Equity ÷ Total assets = 2 ÷9
Return on assets = Cost of debt × Debt ratio + Cost of equity × Equity ratio
11% = 9% × 7 ÷ 9 + Cost of equity × 2 ÷ 9
Cost of equity × 2 ÷ 9 = 11% - (9% × 7 ÷ 9)
Cost of equity = ( 11% - (9% × 7 ÷ 9) ) × 9 ÷ 2
= 18%