Refer to the Par, Inc., problem described in Section 2.1. Suppose that Par, Inc., management encounters the following situations:

a. The accounting department revises its estimate of the profit contribution for the deluxe bag to $18 per bag.

b. A new low-cost material is available for the standard bag, and the profit contribution per standard bag can be increased to $20 per bag. (Assume that the profit contribution of the deluxe bag is the original $9 value.)

c. New sewing equipment is available that would increase the sewing operation capacity to 750 hours. (Assume that 10A + 9B is the appropriate objective function.) If each of these situations is encountered separately, what are the optimal solution and the total profit contribution?