i got 19.10 four times as my answer and it says its incorrect please help

Martinet Company's relevant range of production is 7,500 units to 12,500 units. When it produces and sells 10,000 u average costs per unit are as follows: Average Cost Per Unit Direct materials $5.20 Direct labor $2.70 Variable manufacturing overhead $1.50 Fixed manufacturing overhead $4.00 Fixed selling expense $2.20 Fixed administrative expense $2.00 Sales commissions $1.00 Variable administrative expense $0.50 15. What incremental manufacturing cost will Martinez incur if it increases production from 10,000 to 10.00 (found to 2 decimal places.) Answer is complete but not entirely correct. mental cost per unit ded $ 10.15