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Write out the formula "Marginal Cost=Change in Total Cost/Change in Total Quantity. Make a column to the right of total cost that says "Marginal Cost. Find change in total cost by subtracting the total cost in row 3 from total cost in row 2. Find the change in total quantity by subtracting the total quantity in row 3 from the total quantity in row 2. Plug your numbers into the formula. Write your marginal cost in the column on the second row.

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" " Your first line in the column will remain blank, because you cannot figure out a marginal cost based on no units of production. $40 minus $30. For example, 2 minus 1. For example, Marginal Cost=$10/1. In this case, the marginal cost is $10. Continue to subtract figures from the row above to figure out marginal cost for the remaining units of production.