1-3 answered here: https://www.chegg.com/homework-help/questions-and-answersiagra-chemical-company-produces-three-products-using-three-different-continuous-processes-q35622011?trackid=uZyrSRcc

Niagra Chemical Company produces three products using three different continuous processes. The products are Yarex, Darol, and Norex. Projected sales in gallons for the three products for the years 20x2 and 20x3 are as follows: 20x3 Yarex140,000 150,000 100,000 90,000 70,000 80,000 20x2 Darol Norex Because of the continuous nature of Niagra's processes, work-in-process inventory for each of the products remains constant throughout the year Inventories are planned for each product so that the projected finished-goods inventory at the beginning of each year is equal to 7 percent of that year's projected sales The conversion requirements in hours per gallon for the three products are Yarex, 0.08 hours; Darol, 0.11 hours; and Norex, 0.17 hours. The conversion cost of $10 per hour is considered 100 percent variable The raw-material requirements of the three products are shown in the following chart. Raw Units Price Yarex Darol Norex Material Gamma Murad Islin Tarden pounds $ 8 pounds 6 gallons 5 gallons 10 0.5 1.0 0.7 0.5 0.3 0.5 0.4 Raw-material inventories are planned so that each raw material's projected inventory at the beginning of a year is equal to 5 percent of the previous year's usage of that raw material 4-a. Assume that for 20x2 production, Niagra Chemical Company could replace the raw material Islin with the raw material Philin. The usage of Philin would be the same as the usage of Islin. However, Philin would cost 20 percent more than Islin and would cut production times on all three products by 10 percent. Compare cost of using Philin over using Islin in cost of raw material in conversion cost in production cost 4-b. Which raw material should the management use for the 20x2 production? OIslin Philin