Consider the linear program given below (almost the same as the previous problem - the only difference is that the right hand side of the first constraint has been increased from 10 to 11):

Decision variables: A, B, C, and D

Objective: maximize 3 A + 5 B + C +2 D

Constraints:

A + B + C + D <= 11

A B = 0

A + B C D <= 0

Solve it using Excel. How much has the objective function value increased (compared with the earlier case when the right hand side of the first constraint was 10)? (Note: what is needed is the "increase" in objective function value, NOT the new value of the objective function. As before, please assume that all variables are non-negative)