The Rolling Department of Kraus Steel Company had $4,400$ tons in beginning work in process inventory $(50\%$ complete$)$ on October $1.$ During October, $72,900$ tons were completed. The ending work in process inventory on October $31$ was $3,600$ tons $(40\%$ complete$).$

What are the total equivalent units for direct materials for October if materials are added at the beginning of the process?

fill in the blank $1$

units