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The Engine Guys produces specialized engines for "snow climber" buses. The company's normal monthly production volume is $7,000$ engines, whereas its monthly production capacity is $14,000$ engines. The current selling price per engine is $$1,100.$ The cost per unit of manufacturing and marketing the engines at the normal volume is as follows:

$\backslash$table$[[,\backslash$table$[[$Costs per$],[$Unit for$],[$Engines$]]],[$Manufacturing costs:,$],[$Direct materials,$$100$