Let's define our decision variables as:

Xij: 1 if the round-trip ticket use Albuquerque as the origin is purchased and used in the ith day to leave Albuquerque and return on the jth day from San Diego; 0 otherwise.

Wij: 1 if the round-trip ticket use San Diego as the origin is purchased and used in the jth day to leave San Diego and return on the ith day from Albuquerque; 0 otherwise

Let the objective function coefficient of 1 represent the full fare of $750.

Which statement about the objective function coefficient is not true?

A.

The coefficient of X15 is 1.

B.

The coefficient of X18 is 0.55.

C.

There is no variable W15.

D.

The coefficient for W25 is 1.

Q7 to Q10 are based on this problem. Jack lives in Albuquerque and must spend the majority of March on-site with a client in San Diego. His travel schedule for the month is as follows: The usual round-trip ticket price between Albuquerque and San Diego is $750. However, the airline offers a 25% discount if the dates on a roundtrip ticket cover less than seven nights and include a weekend. A 35\% discount is offered for round-trip tickets covering ten or more nights, and a 45% discount is available for round-trip tickets covering 20 or more nights