Google Inc wants to raise capital through issuing equities. The firm decides to issue 600,000 shares through the Dutch auction. Three investment bankers participate in the auction. Banker A submits her bid at $5 per share for 300,000 shares. Banker B submits her bid at $4 per share for 300,000 shares. Banker C submits her bid at $3 per share for 100,000 shares. How much is the selling price per share from this auction?