In each case below, fill in the missing amount. Exercise 4-15 Physical Flow of Units (LO 4-1, 4-3) 1. 9,000 tons ? 2. Work in process, September 1 Units started during September Units completed during September Work in process, September 30 Work in process, February 1 Units started during February Units completed during February Work in process, February 28 Work in process, January 1 Units started during the year Units completed during the year Work in process, December 31 19,000 tons 2,000 tons 13,000 kilograms 1,500 kilograms 9,200 kilograms ? 100,000 gallons 850,000 gallons ? 200,000 gallons 3