L 3 manufactuere three different product lines model a , model b , and model c . More demand than supply exists for all models. the following per unit data apply: selling price: model a 8 0 , model b 7 5 , model c 7 0 direct materials: model a 6 , model b 6 , model c 6 direct labor: model a 1 0 , model b 1 0 , model c 2 0 cariabvle support costs ( 8 per machine hour ) : model a 1 2 , model b 8 , model c 1 6 fixed support costs: model a 1 3 , model b 1 3 , model c 1 3 machine hours to product one unit: model a 1 . 5 , model b 1 . model c 2 if there is a machien breakdown and limited machine capcity which model is the most profitable to produce? model c , cant be determined, model a , or model b