A firm has cost C(Q)=Q3−6Q2+15QC(Q) = Q^3 - 6Q^2 + 15QC(Q)=Q3−6Q2+15Q. At what output level is average cost ACACAC minimized?
Q=3Q = 3Q=3
Q=2Q = 2Q=2
Q=1Q = 1Q=1
Q=0Q = 0Q=0