FC = 20 x 10 = 200, just as it does when output is 5.
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We can see numerically that the Fixed Cost area will be the same no matter what level of output is used to compute it from the graph.
First consider the case when output is 5. At that output ATC = 80 and AVC = 40. Since AFC = ATC - AVC then AFC must be 40. So:
FC = 5 x 40 = 200.
When output is 20, ATC = 45 and AVC = 35, so:
FC = 20 x 10 = 200, just as it does when output is 5.
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