can you write the formula ? or steps to find answer ?

Weighted % Weight 50% 10% 0% Weighted Cost ost ost Debt Preferred Shares 0 0 0 10% 11% ommon 15% 0 quity 10% f Capital fter tax cost f debt efore tax cost f debt oupon ayments me 0 0 50 10 urrent Price f bond 1,000.00 uating a projett 13.13 WACC for a company: Capital Ltd has a capital structure that is financed, based on cur- rent market values, with 50 per cent debt, 10 per cent preference shares and 40 per cent ordinary shares. If the return offered to the investors for each of those sources is 8 per cent, 10 per cent and 15 per cent for debt, preference shares and ordinary shares, respectively what is Capital Ltd's after-tax WACC? Assume that the company's corporate tax rate is 30 per cent