Rhonda Corporation's relevant range of activity is 3,000 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 $ 5.40 Direct labor $ 3.55 Variable manufacturing overhead $ 1.70 Fixed manufacturing overhead $ 4.05 Fixed selling expense $ 0.60 Fixed administrative expense $ 0.40 Sales commissions $ 1.00 Variable administrative expense $ 0.40 If 5,000 units are produced and sold, the fixed manufacturing overhead cost per unit is closest to: