This was in my book but am unsure how to calculate the second question if they issue new common stock. If you could explain that'd be great! Thanks

Write the equation for the WACC. Firm A has the following data: Target capital structure of 46% debt, 3% preferred, and 51% common equity; Tax rate 40%, rd 7%; r. 7.5% 11.5%; ie 12.5%. What is the firm's WACC if it does not issue any new stock? (8.02%) what is Firm A's wACC if it issues new common stock? (8.53%) Firm A has 11 equally risky capital budgeting projects, each costing s19,608 million and each having an expected rate of return of 8.25%. Firm A's retained earnings breakpoint is $196.08 million. The firm's WACC using retained earnings is 8.2% but increases to 8.5% if new equity must be issued. The company invests in projects where the expected return exceeds the cost of capital. How much capital should Firm A raise and invest? Why? ($196.08 million; the 11th project would have a higher WACC than its expected rate of return.)