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A firm operates in the short run with total fixed costs of $8,000

Economics Dec 15, 2020

A firm operates in the short run with total fixed costs of $8,000.00 and total variable costs (TVC) related to the quantity of output as shown below.

Q TVC ($)
0 0.00
1 7,500
2 13,500
3 17,500
4 21,000
5 25,000
6 29,500
7 35,000
8 42,500
9 50,500
10 62,200

A. Calculate the average variable cost when output is 4 units.

B. Calculate the average total cost when output is 6 units.

C. What is the marginal cost of the 9th unit of output?

Expert Solution

A:$5,250

Average variable cost is TVC over quantity which at a quantity of 4 is 21,000/4=$5,250

B:$6,250

Average total cost is total cost over quantity. Total cost at quantity 6 is TVC plus fixed cost which is 29,500+8,000=37,500. This means average total cost is 37,500/6=$6,250.

C:$8000

The marginal cost of the 9th unit of output is the change in TVC from a quantity of 8 to 9 which in this case is 50,500-42,500=$8000

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