Product A B C Direct materials $ 34.90 $ 51.40 $ 57.80 Direct labour 22.30 24.90 15.70 Variable manufacturing overhead 2.10 1.50 1.40 Fixed manufacturing overhead 12.00 7.60 8.20 Unit product cost $ 71.30 $ 85.40 $ 83.10 Additional data concerning these products are listed below. Product A B C Mixing minutes per unit 1.30 1.10 0.40 Selling price per unit $ 79.00 $ 101.40 $ 94.90 Variable selling cost per unit $ 2.70 $ 3.20 $ 3.00 Monthly demand in units 2,900 4,200 2,200 The mixing machines are potentially the constraint in the production facility. A total of 9,170 minutes are available per month on these machines. Direct labour is a variable cost in this company. Required: a. How many minutes of mixing machine time would be required to satisfy de