Solve the system 
using the inverse method.
Definitions:
Marginal Cost
Incremental cost increase for manufacturing another unit of a product or service.
Total Revenue
The overall amount of money generated from the sale of goods or services before any expenses are subtracted.
Output
The quantity of goods or services produced in a given time period.
Price Per Unit
The cost of a single unit of a product or service.
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Q138: Solve the system using the inverse method.