The table below shows how total donations, average donations, total labor costs and average labor costs vary depending on the number of employees State U hires for its fundraising activities. 
The marginal cost of the 4th employee is:
Definitions:
Cuboidal Epithelial Cells
Cube-shaped cells found lining various ducts and glands, playing a role in secretion and absorption.
Boyle's Law
A gas law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
Henry's Law
A gas law that states the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid, provided the temperature is constant.
Dalton's Law
A principle stating that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.
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