Auden makes three types of vitamin supplements, all of which require the use of encapsulating machines that have capacity of 10,000 hours. Information on the three types (per case) follows: Antioxidant+ $160 90 0.8 Vita-Stress $125 70 0.50 Basic Selling price $100 Variable cost 50 Machine hours required 0.4 What is the contribution margin per hour of machine time for each type? (Basic/Vita-Stress/Antioxidant+)