6.9 percent : The correct answer is: 6.9 percent.
The weighted average cost of capital (rounded to one decimal place) is 6.9%. The formula to calculate the weighted average cost of capital is as follows:
Ka = p1k1 + p2k2 + …pnkn
Where:
ka = cost of capital (expressed as a percentage)
p = proportion that element comprises of the total capital structure
k = cost of an element in the capital structure
n = different types of financing (each with its own cost and proportion in the capital structure)
The weighted average cost of capital (Ka) is the weighted average costs of debt, preferred stock, retained earnings, and common stock sales.
The cost of debt is 4.8% and its weight is 0.3 (30%).
The cost of preferred stock is the preferred stock dividend divided by its net price (price less flotation costs) which is 0.08($105)/($105-$5) = $8.4/$100 = .084 (or 8.4%).
The weight for preferred stock is 0.2(20%).
The cost of retained earnings is the cost of internal equity.
The cost of common stock is the cost of external equity.
Using the constant dividend growth model (Gordon’s model), the cost of retained earnings (Ke) is calculated by taking the next dividend payment and dividing it by the net price plus the constant dividend growth rate. There is no dividend growth rate for Williams.
For Williams , Kee = $7 / ($100-$3-$5) = $7 / $92 = .076 (or 7.6%).
Therefore, Ka = 0.3(0.048) + 0.2(0.084) + 0.1(0.07) + 0.4(0.076) = 0.0144 + 0.0168 + 0.007 + 0.0304 = 0.0686 (or 6.9% rounded).