MC = dTC/dq = 24 - 0.09q + 0.00015q2
(a) Profit is maximized when P = MC.
24 - 0.09q + 0.00015q2 = 24
0.00015q2 = 0.09q
Assuming q is non-zero, dividing by q:
0.00015q = 0.09
q = 600
Revenue (TR) = P x q = 24 x 600 = 14,400
TC = 3,000 + (24 x 600) - (0.045 x 600 x 600) + (0.00005 x 600 x 600 x 600) = 3,000 + 14,400 - 16,200 + 10,800
= 12,000
Profit = TR - TC = 14,400 - 12,000 = 2,400
(b) Shut-down price is the minimum value of AVC.
TVC = 24q - 0.045q2 + 0.00005q3
AVC = TVC/q = 24 - 0.045q + 0.00005q2
AVC is minimized when dAVC/dq = 0.
dAVC/dq = - 0.045 + 0.0001q = 0
0.0001q = 0.045
q = 450
Shut-down price = AVCminimum = 24 - (0.045 x 450) + (0.00005 x 450 x 450) = 24 - 20.25 + 10.125 = 13.875
In this case,
TR = 13.875 x 450 = 6,243.75
TVC = AVC x q = 13.875 x 450 = 6,243.75
TC = 3,000 + TVC = 3,000 + 6,243.75 = 9,243.75
Loss = TC - TR = 9,253.75 - 6,243.75 = 3,000
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