A transport company is interested in measuring its specific cost of capital of different sources as well as the overall cost of capital the following information is provided and is associated with the sale of equity shares preference share and debentures. Equity share the current market price of equity is 125 per share and the firm is expected to pay a dividend of 15 at the end of the current year. Growth rate in dividends is 9%.the new equity share can be sold at 123 per share (an underwriting fee of 2 per share is payable) the 15% preference share of 100 each can be sold at premium of 10% (an underwriting fee of 2 per share is payable) the company sell 15 years 14% debentures of 1,000 each for 970.tax rate is 48%, further the book value of different sources is as follow

Sources Book value

Equity share capital 600

Preference share300

Long term debts 200

Required

Specific cost of capital

Weighted average cost of capital

Explain why cost of internal equity may be different from cost of external equity