Assuming the suppliers are equal in every other respect at what quantity will it make no difference in cost who gets the order?

假设供应商们的条件相当，在没有成本差异的情况下，谁能得到订单并却订单的数量是多少？

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For example, students with a partial meal plan might be able to argue that the money they spend on off-campus food equal to the difference in cost between the partial and full meal plan should get the favorable tax treatment, says Joe Hurley, founder of Savingforcollege.com, which tracks 529 plans.

WSJ: What Counts as a Qualified 529-Plan Expense?