3) The Atlantis Company needs to produce and deliver 9000 parts to a customer. Atlantis has four assembly lines that each can be used in the production of this part. Each assembly line requires a setup before production can begin on the line. Once the setup of a line is performed, the number of parts that can be produced on that line is limited by the production capacity. Also, unit-production cost of the part varies from one line to the other. Assembly Line Setup cost $900 $1500 $2000 $500 Unit-production cost after setup $1.2 $2.0 $2.5 $1.0 Production capacity 6000 8500 9000 4000 Determine how many parts will be produced on each assembly line to minimize the total cost. Make sure that the production quantities are all integer. a) (2 points) Define the variables. b) [14 points) Write the mathematical formulation of the problem. c) [4 points) Solve the problem in Excel Solver and submit the file in Canvas. State the optimal solution here