Refer to the following table: 
What is the marginal cost for the 5th unit of the activity?
Definitions:
Microgram
A unit of mass in the metric system, equal to one-millionth of a gram.
Milliliters
A unit of volume in the metric system, equal to one thousandth of a liter or about 0.0338 fluid ounces.
Liter
A metric unit of volume equal to 1,000 milliliters or about 0.264 gallons.
Kilograms
A unit of mass in the metric system equal to 1,000 grams.
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