Final answer:
The company's estimated cost of equity capital is 13.79%.
Step-by-step explanation:
The estimated cost of equity capital can be calculated using the Capital Asset Pricing Model (CAPM). The formula for CAPM is:
Cost of Equity = Risk-Free Rate + Beta * (Expected Return on Market - Risk-Free Rate)
Plugging in the values given in the question:
Cost of Equity = 5.1% + 1.1 * (13% - 5.1%) = 5.1% + 1.1 * 7.9% = 5.1% + 8.69% = 13.79%