The market inverse demand curve is P = 20 - 2(q1+ q2), where q1 and q2 are Firm 1's and Firm 2's output measured in hundreds of units in the Stackelberg competition. Firm 1, the first-mover, has a marginal cost of $4, and Firm 2 has a marginal cost of $2. Discuss how much output does each firm produce?