McKinney Company produces 50,000 units of Product Q and 6,000 units of Product Z during a period. In that period, four set-ups were required for color changes. All units of Product Q are black, which is the color in the process at the beginning of the period. A set-up was made for 1,000 blue units of Product Z; a set-up was made for 4,500 red units of Product Z; a setup was made for 500 green units of Product Z. A set-up was then made to return the process to its standard black coloration and the units of Product Q were run. Each set-up costs $500. Refer to McKinney Company. If set-up cost is assigned on a volume basis for the department, what is the approximate per-unit set-up cost for Product Z? Select one: a. $.036 b. None of the responses are correct C. $.010 d. $.040