Firm A is considering a merger/acquisition with Firm B. Based on the following data, what is the stock exchange ratio if Firm A negotiates a merger with Firm B and if all the synergy gain goes to Firm A's shareholders? Firm A: Market value of debt: $4 million Market value of equity: $6 million Number of shares: 0.5 million Estimated total firm value based on value-based management model if the merger takes place: 12 million Firm B: Market value of debt: $6 million Market value of equity: $7 million Number of shares: 0.5 million Estimated total firm value based on value-based management model if the merger takes place: 15 million