math
posted by Seb .
A gift shop owner plans to give away calendars during the 31 days in January. Signs in her store say that the first 100 customers each day will receive a calendar. Should the owner estimate or find the exact product when placing her order for the calendars? Explain your reasoning.

math 
PsyDAG
Yes, but how many customers does she usually have in a day? Will some customers come in more than once in a month? If there are less that 100 customers/day, will all of them want a calendar?
These are some things to consider, but the data is not available on your post.
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