Based on the information given the short-run marginal cost of 1 unit of output is approximately $5.00.
Using this formula
Marginal cost=Change in cost/Change in quantity
Where:
Change in cost=$15 per hour
Change in quantity=3 units per hour
Let plug in the formula
Marginal cost=$15/3
Marginal cost=$5.00
Inconclusion the short-run marginal cost of 1 unit of output is approximately $5.00.
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