The XYZ Company plans to allocate some or all of its monthlyadvertising budget of $75,000 in the area. It can purchase localradio spots at $120 per spot, local TV spots at $500 per spot, andlocal newspaper advertising at $260 per insertion.
    The company's policy requirementsspecify that the company must spend at least $30,000 on TV andallow monthly newspaper expenditures up to $15,000. The company’sinternal policy also requires that the company must buy at least100 radio spots.
The payoff from each advertising medium is a function of thesize of its audience. The general experience of the firm is thatthe values of insertions and spots in terms of \"audience points\"(arbitrary unit), are as given below:
       ---------------------------------------------------------------------------
        Radio                           150 audience points perspot
        TV                              180 audiencepoints per spot
        Newspapers                  280audience points per insertion
       ---------------------------------------------------------------------------
Let x1 = no. of Radio spots to be purchased,
       X2 = no. of TV spotsto be purchased, and
       X3= no. of Newspaperinsertions.
Max   150x1+ 180x2 + 280x3
s.t.
     (1)     120x1 + 500x2 + 260x3 <= 75,000    (Advertising Budget)
     (2)                     500x2                 ≥ 30000     (Expenditure on TV)
         (3)                                     260x3<= 15000      (Expenditure onNewspaper)
         (4)                 x1                           ≥  100        (Number of radiospots)
             X1, x2, x3 >= 0
LINEAR PROGRAMMING PROBLEM
MAX 150X1+ 180X2 + 280X3
Subject to:
- 120X1 + 500X2 + 260X3 < 75000
- 500X2 > 30000
- 260X3 < 15000
- 1X1 > 100
     OPTIMAL SOLUTION
     Objective Function Value=      67050.000
               Variable                  Value                  ReducedCosts
             -------------                ---------               --------------------
                Â
                   X1                       375.000                    0.000
                   X2                         60.000                    0.000
                   X3                           0.000                  45.000
              Constraint              Slack/Surplus           Dual Prices
            ---------------           -------------------         ---------------
                     1                            0.000                         1.250
                     2                            0.000                       - 0.89
                     3                    15000.000                         0.000
                     4                        275.000                         0.000
   Â
                           Â
  OBJECTIVE COEFFICIENT RANGES
     Variable              Lower Limit         CurrentValue           Upper Limit
  ---------------          ------------------     -------------------     ----------------------
           X1                           129.231                  150.000          No Upper Limit
           X2                No LowerLimit                180.000                       625.000
           X3                No LowerLimit                280.000                       325.000
RIGHT HAND SIDE RANGES
      Variable              Lower Limit         CurrentValue           Upper Limit
  ---------------          ------------------     -------------------     ----------------------
           1                       42000.000              75000.000          No Upper Limit
           2                               0.000              30000.000                   63000.000
           3                               0.000              15000.000          No Upper Limit
           4                No LowerLimit                100.000                       375.000
1. Which constraint(s) is/are binding (active)?
2. Interpret the dual price of 1.25 for Constraint1.