Equivalent Units of Materials Cost

The Rolling Department of Jabari Steel Company had $3,900$ tons in beginning work in process inventory $(60\%$ complete$)$ on October $1.$ Durins

completed. The ending work in process inventory on October $31$ was $3,200$ tons $(70\%$ complete$).$

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

$x$ units