Adens Corporation's relevant range of activity is 2,000 units to 6,000 units. When it produces and sells 4,000 units, its average costs per unit are as follows: Average Cost per Unit Direct materials $ 6.25 Direct labor $ 2.80 Variable manufacturing overhead $ 1.55 Fixed manufacturing overhead $ 2.40 Fixed selling expense $ 0.50 Fixed administrative expense $ 0.40 Sales commissions $ 1.00 Variable administrative expense $ 0.50 If 5,000 units are sold, the variable cost per unit sold is closest to: