Refer to the figure below to answer the following questions. 
Figure 7.3.1
The figure shows the market for shirts in Canada,where D is the domestic demand curve and S is the domestic supply curve.The world price is $20 per shirt.Canada imposes a tariff on imported shirts of $4 per shirt.
-Refer to Figure 7.3.1.The Canadian government's revenue from the tariff is ________.
Definitions:
Gene Flow
The transfer of genetic variation from one population to another, which can influence the genetic composition of future generations.
Mutation
A change in the DNA sequence within a gene or chromosome of an organism resulting in the creation of a new character or trait not found in the parental type.
Isolation
The process or state of being separated from others, which can be physical, social, or emotional.
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