Coca Cola manufacturers a standard juice. During February, the firm's Assembly Department started production of 75,000 boxes. During the month, the firm completed 85,000 boxes. and transferred them to the Finishing Department. The firm ended the month with 5,000 boxes. in ending inventory. All direct materials costs are added at the beginning of the production cycle. Conversion costs are incurred uniformly over the production cycle. Weighted-average costing is used by Coca Cola. WIP beginning inventory is .a boxes 25,000 .b boxes 15,000 . boxes 20,000 .d boxes 10,000