The figure below shows the supply and demand curves for oranges in Smallville. 
What is the marginal cost of producing the tenth pound of oranges?
Definitions:
Independent Variable
In an experiment, the variable that is manipulated or changed to observe its effect on the dependent variable.
Sweets
Food items that are rich in sugar and often used as a treat or dessert.
Dependent Variable
The variable in an experiment that is expected to change as a result of manipulations to the independent variable.
Experimenter's Manipulations
The deliberate alteration of variables by a researcher in an experiment to determine their effects on the outcome.
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