Saline Solutions uses process costing to account for production of its unique compound BG at its River Plant. The River Plant has two departments: R and S. Raw materials are added at two points in the production of BG. First, rubber pellets are added at the beginning of production in Department R. Next, a liquid thinner is added in Department R when the production is 60% complete with respect to conversion costs. Once the basic compound is completed in Department R, it is transferred to Department S for mixing and packaging. No new material is added in Department S. The following information is available from the River Plant for May. Department S Production Costs: May Beginning inventory (50,000 units, 30% complete with respect to Department S costs) Total cost (Department R and Department S): Beginning inventory $ 482,484 Current work (490,000 units started) o Department R costs: $ 3,449,600 o Department S costs: $ 1,594,376 The ending inventory has 70,000 units, which are 100 percent complete for Department R costs. a. Presume the cost per equivalent unit for May for materials in Department Sis $ 7.20 and for conversion costs is $ 3.20. How complete is ending inventory with respect to conversion costs? b. Prepare the journal entry for the transfer of the finished product for May. C. What is the balance (in $$) in WIP for Department S at the end of May