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Product YZ2 is made in a production process where machine time is a bottleneck resource. Production of one unit of Product YZ2 takes 0.25 machine hours. The costs and selling price of Product YZ2 are as follows: $ Materials 10 Labour (0.5 hours) 7 Other factory costs 7 24 Sales price 30 Profit 6 In a system of throughput accounting, what is the return per factory hour? $