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Calculator and paper with the words Variable Costs and Fixed Costs. variable costs include raw materials, direct labor, and sales commissions.
Male plumber replacing fill valve in toilet tank
A faulty accessory belt tensioner causes belt loosening and slippage, leading to inefficient equipment operation. Selective focus.
Focused teenage boy repairing a bicycle tire, using a hand pump or checking the valve on an outdoor patio in autumn
Mechanic pouring engine oil into car engine. Oil change service, car repair, engine inspection and maintenance.

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