Five existing assembly lines have the flexibility to handle two products, but a huge jump in budgeted demand requires adding additional lines.

Operations are scheduled for 300 days/year with two shifts of 10 hours each per day. In order to ensure they can react to rush or large orders, a 12% capacity cushion is desired. How many additional assembly lines are needed to deal with the following forecast:

                                Model A    Model B

   Annual Demand     40,000       60,000

   Set-up Time/ Batch   4 hrs          6 hrs

   Run Time per unit    45 min       30 min

   Batch Size                2,000         3,000