Use the following to answer question: 
-(Table: Total Product and Marginal Product) Use Table: Total Product and Marginal Product.Negative marginal returns begin when the _____ worker is added.
Definitions:
Total Expenses
The sum of all costs and expenses incurred by a business during a specific period, including operational and non-operational costs.
Flexible Budget
A budget that adjusts to changes in the volume of activity, providing a more accurate basis for performance evaluation.
Customers Served
Refers to the number of individual customers or client accounts a business has successfully provided its products or services to within a specific period.
Activity Level
A measurement of the volume of activity or production within a company, often influencing costs and operational efficiency.
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