Directions Complete the Grey boxes. 1 Kubin Comparw/s relevant range of production is 18,000 10 22,000 units Whenis produces and sells 20 ,000 units, ils average costs per unit are as follows Directions Complete the Grey boxes. 1 Kubin Comparw/s relevant range of production is 18,000 10 22,000 units Whenis produces and sells 20 ,000 units, ils average costs per unit are as follows