ABC Co$.$ is to plan its workforce and production levels for next year. Forecast demands for the next $4$ quarters are $1160,960,1150,1380$ units. Ending inventory of last year is expected to be $60,$ and the ABC would like to have a minimum of $50$ units in inventory at the end of next year. The cost of holding one unit in inventory for one quarter is $$190.$

There are currently $200$ workers. The cost of hiring one worker is $$700,$ and the cost of firing one worker is $$1500.$

In the past, the plant manager observed that over $60$ workings days and with the workforce level constant at $200$ workers, ABC produced $1200$ units.