Create a model and solve the problem using Solver module.

The college director of global activities was hopeful that the print ads in the school newspaper and 30 second spots on the campus radio station would spur some interest in the array of study tour and study abroad options he had secured. The communications director for the college had other ideas; she favored a social media campaign consisting of tweets and Facebook postings. "This is the most ridiculous thing I ever heard of," he whined to the dean. The advertising budget is $3500, but there is no requirement that all the money be spent. The newspaper has only four issues before the end of the semester, but the radio is a 24/7 operation and has two dozen 30 second slots available. Facebook postings must be alternated with the rest of the mindless drivel posted on the college page; thus there is space for only three postings before the end of the semester. Twitter is complicated by the 140-character requirement. The communications director feels she needs five tweets to convey a single message about tours and semesters abroad, so for one message, the cost would be $125 and at most 700-character for a single ad, but the exposure is the same as 1400 students. Due to thumb fatigue, she feels that she has only 2800 characters left in her thumbs before the end of the semester