wing plc. purchases oil from WTI oil rig and processes the oil into three types of oil products, Gasoline, Kerosene and Diesel. A by product Sulphur also emerges from this process which has a net realisable value 100,000. This joint process results in the following costs of products for a typical month: Direct materials 1,000,000 Direct Labour 500,000 Overheads __600,000 2,100,000 By product Product yields and average sales values on a per-unit basis from the joint