Based on the figure, if a union contract requires that the wage workers are paid be raised from $25 to $30 per hour, the number of unemployed workers will increase by ________ workers. 
Definitions:
Patent
A barrier to entry that grants exclusive use of the patented product or process to the inventor.
Soda Cans
Aluminum containers used for packaging soft drinks and other beverages, chosen for their lightweight, durability, and recyclability.
Marginal Cost
The cost for the creation of one extra unit of a product or service.
Marginal Revenue
The extra revenue obtained by selling an additional unit of a product or service.
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