Helix corporation uses weighted average method in its process costing system. it produces prefabricated flooring in a series of steps carried out in production departments all the materials that is used in the first production departments is added at the beginning of the processing in that department. data for may for its production departments below: units materials conversion work in process inventory may 1 5000 100% 40%

work in process inventory may 31 10000 100% 30%