Exhibit 3-5 shows the supply schedule for Tucker's Cola. Suppose there are four additional suppliers of cola in the market. When the price per gallon of cola is $1.50, the first supplier is willing to sell 10 million gallons, the second supplier is willing to sell 2 million gallons, the third supplier is willing to sell 5 million gallons, and the fourth supplier is willing to sell 0 gallons. The market quantity supplied of cola when the price is $1.50 is