Final answer:
The estimated cost of common stock equity is 17.52%.
Step-by-step explanation:
The estimated cost of common stock equity can be calculated using the formula:
Cost of Common stock equity = Risk-free rate + (Beta x Risk Premium)
Substituting the given values, the estimated cost of common stock equity = 6% + (1.2 x 9.6%) = 6% + 11.52% = 17.52%
Therefore, the estimated cost of common stock equity is 17.52%.