Solve the linear programming model formulation in Problem 41 for Island Publishing Company graphically.
a. Determine the sensitivity range for the advertising revenue generated by the real estate guide.
b. Does the company spend all of its printing budget? If not, how much slack is left over?
c. What would be the effect on the optimal solution if the local real estate agents insisted that 12,000 copies of the real estate guide be distributed instead of the current 8,000 copies, or they would withdraw their advertising?