The manager of a department store in Seattle is attempting to decide on the types and amounts of advertising the store should use. He has invited representatives from the local radio station,television station, and newspaper to make presentations in which they describe their audiences. The television station representative indicates that a TV commercial, which costs $15,000, would reach 25,000 potential customers. The breakdown of the audience is as follows:

Male Senior 5000 Young 5000

Female Senior 5,000 Young 10,000

The newspaper representative claims to be able to provide an audience of 10,000 potential customers at a cost of $4,000 per ad. The breakdown of the audience is as follows:

Male Senior 4000 Young 2000

Female Senior 3,000 Young 1,000

The radio station representative says that the audience for one of the station’s commercials, which costs $6,000, is 15,000 customers. The breakdown of the audience is as follows:

Male Senior 1500 Young 4500

Female Senior 1,500 Young 7,500

The store has the following advertising policy:   Use at least twice as many radio commercials as newspaper ads.   Reach at least 100,000 customers.   Reach at least twice as many young people as senior citizens.   Make sure that at least 30% of the audience is female. Available space limits the number of newspaper ads to seven. The store wants to know the optimal number of each type of advertising to purchase to minimize total cost.

a. Formulate a linear programming model for this problem.

b. Solve the model by using the computer.

c. Suppose a second radio station approaches the department store and indicates that its commercials, which cost $7,500, reach 18,000 customers with the following demographic breakdown:

Male Senior 2400 Young 4000

Female Senior 3,600 Young 8,000

If the store considered this station along with the other media alternatives, how would this affect the solution?

please answer C only