Please explain and answer:

Martinez Company's relevant range of production is 8,500 units to 13,500 units. When it produces and sells 11,000 units, its unit costs are as follows: Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Fixed selling expense Fixed administratlve expense Sales commissions Variable administrative expense Amount Per Unit $ 5.10 $2.60 $1.60 $3.10 $ 2.10 $ 2.10 $1.10 0.55