A firms' total cost is $500 when its quantity is 80 units. Its total cost increases to $510 when its quantity increases to 81 units. What is the firm's marginal cost?
a. 6.25
b. 10
c. 5
d. 6.29
e. none of the above
b. 10 (500-510) / (80-81) = 10/1 = 10
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