6b) Suppose Joe and Sarah have the same cost functions as earlier (constant MC of $5) but market inverse demand is now P(Q) = 30 - 0.2Q (7) For each situation, solve for the Stackelberg equilibrium 7a) Suppose Sarah's constant MC is $5 but Joe's is $8. (Using P(Q) = 20-0.1Q again and assuming Joe goes first) 7b) Suppose Joe and Sarah have the same marginal cost ($5) but market inverse demand is now P(Q) = 30 - 0.2