Answer and Explanation:
As per the data given in the question,
WACC = Cost of equity × weight of equity +cost of debt or yield to maturity × weight of debt ×  (1 -Tax Rate)
= 16% ×  40% + 12% ×  60% × (1-30%)
= 11.44%
The project should be accepted b the firm or should start disk drive manufacturing business because WACC is less than IRR which is 11.44%
i.e. WACC<12.50%
Weighted cost of capital should be lower than IRR coming from the project.