Question 3. Spreadsheet model (25 marks) Consider the following mathematical model. Prepare a spreadsheet model for this model, and solve it using Excel solver to get an optimal solution. Max Z = 2xy + x2 + 4x3 +3x4 subject to xy + x2 +3x3 + 2x, 54 x; x3 + x4 21 x + 2x2 + x3 + 2.x4 = 6 X; > 0, x2 > 0, xz 20, x4 20 a. Use meaningful labels in your spreadsheet model. Labels include x1, x2, x3, and x4 for the name of the variables, constraint 1, 2, and 3 for the name of the functional constraints, right-hand side values, objective function coefficients, and objective function value. (5 marks) b. Copy each formula you have used in a cell of your spreadsheet model and paste it and its address here. For example, G8=SUMPRODUCT(C8:58,C11:F11). (5 marks) C. Report a screenshot of your spreadsheet model that has been solved and the optimal solution can be seen in it. (15 marks)