Builder Products, Incorporated, uses the weighted-average method in its process costing system. It manufactures a caulking compound that goes through three processing stages prior to completion. Information on work in the first department, Cooking, is given below for May: Production data: Pounds in process, May 1; materials 100% complete; conversion 90% complete 80,000 Pounds started into production during May 450,000 Pounds completed and transferred out ? Pounds in process, May 31; materials 60% comp