18 1 pts LA Baker is a bread bakery house at LA. It currently has one store which has store managers and staff. Each of store managers fannual salary cost, $30,000 each) can oversee 25,000 machine hours of baking activity. Thus, if LA Baker has 25,000 hours of baking activity, one manager is needed; for 50,000 hours, two managers are needed; and so forth. It is unlikely that LA Baker would ever need more than two store managers. LA Baker's store manager salary cost can best be described as a: O Super variable cost O Variable cost O Variable cost with economies of scale Step-Fixed cost