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How does a “minimum number of items to be bought” factor into break even analysis? 
A minimum purchase quantity just means that you need to round your result up to the nearest 100. In your example it comes out evenly. If we look at an example where it doesn't come out even, you'd round up: And round that up to 700 due to purchase quantities. For a slightly more complex and accurate approach, you'd then evaluate how many of the extras you had to buy due to the minimum purchase quantity would need to be sold: So you'd have to sell 694 of the 700 purchased to break even.