Simplify the numerical expression. 
Definitions:
Variable Costing
An accounting method that includes only variable production costs—direct materials, direct labor, and variable manufacturing overhead—in product costs, excluding fixed overhead.
Direct Labor Cost
The total cost of labor directly involved in the production of goods, including wages and benefits.
Break-Even Point
The level of sales at which profit is zero.
Units Sold
The quantity of product units sold by a company during a particular period.
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