Because most of the parts for its irrigation systems are standard, Waterways handles the majority of its manufacturing as a process cost system. There are multiple process departments. Three of these departments are the Molding, Cutting, and Welding departments. All items eventually end up in the Packaging Department, which prepares items for sale in kits or individually. The following information is available for the Molding department for January. Work in process beginning Units in process Stage of completion for materials 20,500 80% Stage of completion for labor and overhead 30% Costs in work in process Inventory: Materials $167,280 Labor 67,080 Overhead 17.180 Total costs in beginning work in process $251,540 Units started into production in January 60,000 Units completed and transferred in January 57,800 Costs added to production: Materials $280,812 Labor 293,471 Overhead 60.780 Total costs added into production in January $635,063 Work in process ending Units in process 22,700 Stage of completion for materials 50% Stage of completion for labor and overhead 10%