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%