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The table shows Jensen's output (sandwich) and costs, a perfectly competitive firm

Economics

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The table shows Jensen's output (sandwich) and costs, a perfectly competitive firm. Jensen's fixed cost is $9 per hour. The current market price is $6. What is Jensen's marginal revenue from the 2nd sandwich sold?

a. $6

b. $12

c. $20

d. $24

e. $30

Quantity	Total fixed costs TFC (dollars)	Total variable costs TVC (dollars)
0	500	0
1	500	100
2	500	180
3	500	220
4	500	300
5	500	390
6	500	500
7	500	640
8	500	800
9	500	1000
10	500	1250