Can you help me solve this general accounting problem with the correct methodology?

None

Atwater Chemicals produces an engine additive for machinery. The additive is produced by adding various ingredients to a petroleum-based lubricant. Atwater purchases the lubricant from two suppliers, Woodlawn Petroleum and Spokane Chemicals. The quality of the final product depends directly on the quality of the lubricant. If the lubricant is "off," Atwater has to dispose of the entire batch. Because all lubricant can be "off," Atwater uses a measure it calls the “yield,” which is computed as Yield = Good output ÷ Input where the output and input are both measured in barrels. As a benchmark, Atwater expects to get 12 barrels of good output for every 16 barrels of lubricant purchased for a yield of 75 percent (= 12 barrels of output ÷ 16 barrels of lubricant). Data on the two suppliers for the past year follow: Woodlawn Petroleum Spokane Chemicals Total Total inputs purchased (barrels) 5,760 3,600 9,360 Good output (barrels) 3,744 3,096 6,840 Average price (per barrel) $ 121.00 $…