Please answer parts 4-8 of this relveant range question, thanks!

Kubin Company's relevant range of production is 11,000 to 14,000 units. When it produces and sells 12,500 units, its average costs per unit are as follows: Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Fixed selling expens Fixed administrative expense Sales commissions Variable administrative expense Amount perUnit $ 7.20 $ 4.20 1.70 $ 4.20 $ 3.70 $ 2.70 $ 1.20 $ 0.70