Amcan Inc. manufactures cans for the canned food industry. The operations manager of a can manufacturing operation wants to conduct a cost study investigating the relationship of tin content in the material (can stock) to the energy cost for enameling the cans. The enameling was necessary to prepare the cans for labeling. A higher percentage of tin content in the can stock increases the cost of material. The operations manager believed that a higher tin content in the can stock would reduce the amount of energy used in enameling. During the analysis period, the amount of tin content in the steel can stock was increased for every month, from April to September. The following operating reports were available from the controller:

Differences in materials unit costs were entirely related to the amount of tin content. Interpret this information and report to the operations manager your recommendations with respect to tincontent.

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D. August September September $ 15,000 29,000 July April May June $ 24,200 2 Energy $ 13,000 12,000 $ 25,000 $ 28,800 30,000 $ 58,800 $ 52,800 + 120,000 $14,000 $16,200 18,900 25,200 3 Materials 4 Total cost 5 Units produced 6 Cost per unit $32,900 $41,400 + 110,000 | +70,000 | +90,000 $047 $ $ 0.46 + 100,000 +50,000 $0.50 0.49 0.48 0.44