For Elliot's dog-walking service, the only variable input is labor. Elliot's labor costs are $300 a day and his service walks 30 dogs per day. To walk 31 dogs per day, his labor costs increase to $305 a day. The marginal cost of walking that 31st dog is
A. $5.
B. $9.83.
C. $19.52.
D. indeterminate from the information given.
Answer: A
Economics
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