linear programming

Solve using EXCEL A Factory operates 5 days a week, 52 weeks per year,and 1 shift per day. Worker's wage is $10 per hour. There are 3 utility workers and 18 similar machines, each operated by 6 direct workers. The factory decreases its manning level when it reduces the number of direct workers. There are 2 automatic machines available to purchase. The specifications include: A new machine can be purchased by financing over its service life and rate of return. Each old machine can be sold at $10,000 and replaced by a new simple or plus model machine. Note that the total number of machines remains constant. If the factory wants to decrease its current manning level by at least 22%, calculate the minimum total annual cost (in dollars) to achieve this goal (round to the nearest integer)