Suppose Dan's cost of making pizzas is

C(Q)=6Q+(Q^2/160)

and his marginal cost is

MC=6+(Q/80)

Dan is a price taker.

a. What is Dan's supply function?

A. Q = 160P + 480 if P 6.

B. Q = 80P - 80 if P 6.5.

C. Q = 80P - 480 if P 6.

D. Q = 80P + 480 if P 6.

E. Q = 80P - 160 if P 6.5.

b. What if Dan has an avoidable fixed cost of $10? What is Dan's supply function?