Total debt = 75,000*1,000 =75 Million
Total equity = 2.5 Million *44 = 110 Million
Total preferred stock = 750,000*64 = 48 Million
Total = 75 +48+110 = 233 Million
Weight of debt = 75/233 = 0.3219
Weight of equity = 110/233 =0.4721
Weight of preferred stock = 1-0.3219-0.4721 = 0.206
After tax Cost of debt =7.5*(1-0.4) = 4.5%
Cost of equity = rf + beta*(rm-rf) = 2.3 + 1.21*(11.2-2.3) = 13.069%
Cost of preferred stock =6/64 = 9.375%
Weight average cost of capital = 0.3219*4.5 +0.4721*13.069 + 0.206*9.375 = 9.55%