Performance Valve, Inc. is a job shop. The management of Performance uses the cost information from the job sheets to assess their cost performance. Information on the total cost, product type, and quantity of items produced is as follows:

a. Develop a graph for each product (three graphs), with Job No. (in date order) on the horizontal axis and unit cost on the vertical axis. Use this information to determine Performance€™s cost performance over time for the three products.
b. What additional information would you require to investigate Performance€™s cost performance moreprecisely?

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Date Job No. Quantity Product Amount Jan. 1 Jan. 29 Feb. 15 Mar. 10 Mar. 31 May 10 June 20 Aug. 2 Sept. 20 Nov. 1 Dec. 3 400 1,200 600 450 900 1,000 400 1,500 400 600 850 7,600 18,000 9,600 7,650 7,200 12,000 4,800 24,000 6,000 6,000 17,850 26 43 AAB AAB 75 91 104 112 114 126 133 2 XXY AAB XXY 2