3. You are to add/adjust constraint(s)/variables(s)/parameter(s)/objective function for Ex- ercise 3 from the second practice problem set (a copy of the problem is also on page 2). Specifically, update the parameterized model to include the following: (a) Facilities has concerns about over-stressing our machines. They indicated that each machine should be used at most 40% of the total time spent to produce all projects, e.g., If machines 1-4 run for 45, 35, 15, and 10 hours respectively, then this would be problematic since machine 1 runs for 45% of the total 100 hours used. Update the model accordingly. (b) While we are supposed to provide di of each product, our contract allows us to produce less at a penalty of p; for each missing unit of product i. Update the model accordingly. (c) Each machine can be run after hours for an increased cost. Specifically, it costs an additional V; for each extra hour (beyond the initial limit of a;) to run machine j. Update the model accordingly