Illinois Instruments (II) is a company that makes calculators. Their three models are: The II-91, which can do basic arithmetic operations. (5 ounces of plastic, 3 hours to produce, sells for $65) The II-92, which can solve linear equations. (8 ounces of plastic, 5 hours to produce, sells for $100) The II-93, which can perform the simplex method. (12 ounces of plastic, 8 hours to produce, sells for $160) Their factory in Champaign receives a shipment of 320 ounces of plastic every week. They have 5 employees making calculators, each of which works for 40 hours every week. (a) How much of each calculator model should II produce each week to maximize profit? (b) The factory manager is considering purchasing more plastic, at a price of $D per ounce. For which range of D is this profitable? (c) At most how many extra ounces of plastic per week could be purchased before your answer to (b) might stop being valid? Illinois Instruments (II) is a company that makes calculators. Their three models are: The II-91, which can do basic arithmetic operations. (5 ounces of plastic, 3 hours to produce, sells for $65) The II-92, which can solve linear equations. (8 ounces of plastic, 5 hours to produce, sells for $100) The II-93, which can perform the simplex method. (12 ounces of plastic, 8 hours to produce, sells for $160) Their factory in Champaign receives a shipment of 320 ounces of plastic every week. They have 5 employees making calculators, each of which works for 40 hours every week. (a) How much of each calculator model should II produce each week to maximize profit? (b) The factory manager is considering purchasing more plastic, at a price of $D per ounce. For which range of D is this profitable? (c) At most how many extra ounces of plastic per week could be purchased before your answer to (b) might stop being valid