4. The Charming City Consulting has four projects to consider. Each will require time (weeks) in the next two months according to the table below. Profit from each project is also shown in the table below. There is 40 weeks' time available in the first month and 28 weeks' time available in the second month. Formulate a zero-one integer optimization problem to maximize total profit for this situation by defining the decision variables, objective function, and all the constraints. Do NOT solve after formulating