The meaning of weighted average cost of capital is simply the mean cost of attracting investors, whether bondholders or stockholders.
Generally, for 30% Debt and 70% Cash, the Cost of Debt after is mathematically given as
X= 0.07 * (1 – 0.20)
X= 0.056
Therefore
WACC = (0.70 * 0.10) + (0.30 * 0.056)
WACC = 0.0868
In conclusion, for 80% Debt and 20% Cash
WACC'' = (0.20 * 0.10) + (0.80 * 0.056)
WACC'' = 0.0648
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