4-18 Consider the following final tableau, where xs, xs, and x7 are slack variables for resources 1, 2, and 3, respectively. (a) Perform a postoptimality analysis for bi and b2 after generating their initial values. (b) Perform a postoptimality analysis for c1 and c2 (c) You have the opportunity to purchase an additional 500 units of the third resource at $1.50 per unit. Should you do so? Why'? fd) Suppose a new variable (say x) were introduced which used 3 units of resource 1, 4 units of resource 2, and 4 units of resource 3. What is the minimum profitability for x to be worthwhile to manufacture? Maximize 4 0 0 ?? 4 5 125 1425 4-18 Consider the following final tableau, where xs, xs, and x7 are slack variables for resources 1, 2, and 3, respectively. (a) Perform a postoptimality analysis for bi and b2 after generating their initial values. (b) Perform a postoptimality analysis for c1 and c2 (c) You have the opportunity to purchase an additional 500 units of the third resource at $1.50 per unit. Should you do so? Why'? fd) Suppose a new variable (say x) were introduced which used 3 units of resource 1, 4 units of resource 2, and 4 units of resource 3. What is the minimum profitability for x to be worthwhile to manufacture? Maximize 4 0 0 ?? 4 5 125 1425