Macy Corporation's relevant range of activity is 4,000 units to 8,000 units. When it produces and sells 6,000 units, its average costs per unit are as follows: Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Fixed selling expense Fixed administrative expense Sales commissions Variable administrative expense Average Cost per Unit $ 4.95 $ 3.25 $ 1.45 $ 4.20 $ 1.05 $ 0.60 $ 1.00 $ 0.50 If the selling price is $23.50 per unit, the contribution margin per unit sold is closest to