This project is a generalization of assignment problem in linear programming models. A detailed explanation must be included for full credit. Unclear and unorganized report will receive zero credit. Tazer, a pharmaceutical manufacturing company, entered the pharmaceutical market $12$ years ago with the introduction of six new drugs. Five of the six drugs were simply permutations of existing drugs and therefore did not sell very heavily. The sixth drug, however, addressed hypertension and was a huge success. Since Tazer had a patent on the hypertension drug, it experienced no competition, and profits from the hypertension drug alone kept Tazer in business. During the past $12$ years, Tazer continued a moderate amount of research and development, but it never stumbled upon a drug as successful as the hypertension drug. One reason is that the company never had the motivation to invest heavily in innovative research and development. The company was riding the profit