Solve the linear programming model formulated in Problem 50 for Mountain Laurel Vineyards by using the computer. a. If the vineyard determined that the profit from Red was $7,600 instead of $8,200, how would that affect the optimal solution? b. If the vineyard could secure one additional unit of any of the resources used in the production of wine, which one should it select? c. If the vineyard could obtain 0.5 ton more of grapes, 500 more hours of production capacity, or enough storage capacity to store 4 more casks of wine, which should it choose? d. All three wines are produced in the optimal solution. How little would the profit for Blanc have to be for it to no longer be produced.