The office manager of a large New York City-based accounting firm needs to replace the aging and out-of-style office furniture in their New York offices. The firm has decided to purchase desk/chair/credenza furniture sets for all 2,000 offices in New York. The company has received bids from four different furniture companies who are willing to supply the furniture sets, as follows:

- Carolina Woodworks has bid to deliver up to 1,000 furniture sets at a cost of $2,500 per set and with a one-time charge of $10,000.
- Nashawtuc Millworks has bid to deliver up to 1,200 furniture sets at a cost of $2,450 per set and with a one-time charge of $20,000.
- Adirondack Furnishing Designs has bid to deliver up to 800 furniture sets at a cost of $2,510 per set with no additional charges.
- Lancaster Artisan Company has bid to deliver up to 1,100 furniture sets at a cost of S2,470 per set and with a one-time charge of S13,000.

Formulate a mixed integer optimization model that could be used to determine how many furniture sets to purchase from each of the four potential suppliers in order to minimize cost.