[Please answer this question by EXCEL Modeling and Solver. Not hand computation please! Thanks! ]

It is summertime and your winter coat factory is trying to decide its production schedule and staffing level for the next season. You are forecasting a demand of 5000 coats in October, 8000 coats in November, 8000 coats in December, 12000 coats in January, 12000 coats in February, and 9000 coats in March. You want to manufacture these coats at the lowest cost possible/

The first decision you need to make is how many people to hire. Each employee will cost $2500 a month. You dont want to hire or fire any employees mid-season in order to minimize disruptions in your factory floor. You can have employees idle if there isnt sufficient work for them to do. Employees still need to be paid even if they are idle. An employee works 20 business days a month and takes half a day to produce one coat. The employees can also be asked to work overtime, in which case you need to pay them $70 per coat they produce. You dont need to assume there is any capacity constraint on the number of overtime hours.

Coats can be produced ahead of time, but holding them in inventory costs $10 a month per coat due to warehousing and financing costs. Whats your ideal staffing level and production schedule?