A) ExxonMobil operates an oil refinery where it processes crude oil into various petroleum products. During the refining process, two main products, gasoline and diesel, are produced simultaneously. Last month, the refinery processed 100,000 barrels of crude oil, resulting in 50,000 barrels of gasoline and 40,000 barrels of diesel. The total cost of processing the crude oil was $5,000,000. Using the net realizable value method, allocate the joint costs to gasoline and diesel. Discuss the challenges associated with joint product costing and its importance in decision-making for ExxonMobil. (20 marks)