Labor is the only variable input for Elliot's dog-walking service. His labor costs are $300 a day and his service walks 25 dogs per day. His labor costs increase to $315.50 a day to walk 26 dogs per day. The marginal cost of walking that 26th dog is
A. $15.50.
B. $19.50.
C. $29.50.
D. indeterminate from the information given.
Answer: A
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