Harrington corporation produces three products, a, b, and c. pertinent information on these products is as follows: product selling price per unit variable cost per unit fixed cost per unit dl hours per unit a (anchor bolts) $ 4.00 $ 1.00 $ 2.00 2 b (bearings) $ 3.50 $ 0.50 $ 2.00 2 c (castings) $ 6.00 $ 2.00 $ 3.00 3 there are 150 direct labor hours available. machine-hour capacity allows 100 anchor bolts, only; 50 bearings, only; 40 casters, only; or any combination of the three that does not exceed the capacity. the direct labor hour constraint for harrington's linear programming model is: