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The Wester Company produces three products with the following costs and :selling prices A B C Selling price $21 $12 $32 VC/u 11 7 18 DLH/u 0.4 0.1 0.7 Machines hours per unit 0.2 0.5 0.2 Demand (in units) 300 500 200 The company has insufficient capacity to fulfil all of the demand for these three products :If direct labour hours (DHL) are the constraint, then the marginal product is ( abei 1) O BO CO none D