Q. At output at which marginal product of labour is maximized, what is happening to marginal cost? When marginal product of labour is maximized, marginal cost is minimized. At what output is marginal cost equal to average total cost? What are implications for average total cost of previous question? MC =ATC when Q =70. When MC =ATC, ATC is at its minimum. At what output is marginal cost equal to average variable cost? What are implications for average variable cost of previous question? MC =AVC when Q =60. When MC =AVC, AVC is at its minimum. What is per unit cost of producing 60 units of output? ATC(60)=$10 What is per unit labour cost of producing 60 units of output? AVC(60)=$6.67 What is per unit fixed cost of producing 60 units of output?