Refer to the graph shown. Given the long-run average cost curve, a seller must produce 18 units just to break even if the price the seller expects is roughly: 
Definitions:
Tempered Frame Rail
A strengthened frame rail, treated by heating and cooling, to enhance durability and load capacity.
Cooling Time
The period needed for a substance or device to decrease in temperature to a specified level after being removed from a source of heat.
Yield Strength
The highest stress a material can withstand without permanent deformation expressed in psi. In steels, yield strength is typically about 10 percent less than tensile strength.
Tempered Steel Alloy
steel that has been heat-treated to increase its strength and toughness, often used in applications requiring durability and resistance to wear.
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