Question 4 (1 point) A firm currently has access to 200 lbs of materials at $2 per lb. In the output of the linear programming problem run by the firm to determine its optimal production plan, the constraint on materials has a shadow price of $0.5 (valid within an allowable increase of 100 lbs on the materials constraint). If the firm procures an additional 20 lbs of materials (at the same cost of $2 per lb), this implies that the total contribution of the firm will Increase by $30 Increase by $10 Decrease by $40 Decrease by $30