Answer:
The WACC change if the new tax rate was adopted is - 0.35%
Explanation:
For computing the WACC change, first we have to determine the after tax cost of debt by applying the 40% and 45% tax rate which is shown below:
After tax Cost of debt = Cost of debt × ( 1- tax rate)
For 40% tax rate, it would be
= 7% × ( 1 - 40%)
= 4.2%
For 45% tax rate, it would be
= 7% × ( 1 - 45%)
= 3.85%
The change in WACC would be
= 3.85% - 4.2%
= - 0.35%