need an explaiantion for d and e

2. Glisan 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: Average Cost per Unit Direct materials .............. $5.75 Direct labor... $3.00 Variable manufacturing overhead.... $1.60 Fixed manufacturing overhead ..... $4.50 Fixed selling expense ............. $0.75 Fixed administrative expense .......... $0.60 Sales commissions $1.50 Variable administrative expense...... $0.55 Recuniade MIS V lis sold? U we selling price is $19.10 per unit, what is the contribution margin per unit sold? e. What incremental manufacturing cost will the company incur if it increases production from 6,000 to 6,001 units