I am guessing that the food pantry is collecting donations/items for a Thanksgiving meal?

Based on that assumption I would guess it would take $4.00 per person. Our town has an area wide Thanksgiving meal served at a local church and they use that as a goal in order to plan how many they are able to serve. Keep in mind, that the $4 per person also includes disposable plates, cups, napkins.

Here is a link http://www.fb.org/news/fbn/html/thanksgiving.html that may be of help to you - it is from last year and may vary slightly, but may give you an idea.

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