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 costper unit dl hours per unit (anchor bolts) $ 3.00 $ 1.00 $ 1.00 2b (bearings) $ 3.10 $ 2.10 $ 2.00 4c (castings) $ 8.00 $ 4.00 $ 2.00 3 there are 160 direct labor hours available. machine-hour capacity allows 80 anchor bolts, only; 70 bearings, only; 50 casters, only; or any combination of the three that does not exceed the capacity. the machine-hour constraint for harrington's linear programming model is: