The total capital assets of the business = Total debt + Total preferred stock + Total common equity
Total capital assets = 3.34 + 1.12 + 1 = 5.46 Million
Weight of firm's preferred stock in calculation of WACC = preferred capital/ total capital assets = 1.12/5.46 = 0.2051 = 20.51%
Weight of firm's preferred stock in calculation of WACC = 20.51%