Suppose a firm's production function is q = F(K,L) = - KOL-P. Assume K is fixed at 36 units in the short-run, w = $4, and r = $1. The short-run production function is equal to The short-run (total) cost function is Variable costs are equal to Fixed costs are equal to The short-run cost of producing 5 units is The equation for (short-run) marginal cost is The marginal cost curve intersects the average total cost curve at a quantity of units