Round Down by a specific number

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Dec 6, 2015
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Hi,
I am trying to round down a number by a the results of a different field in Access 2013

i.e.

I have a pack size of a product which is 25 units

I have an order quantity of lets say 120 units

As I am only able to order stock in full packs I what to get a result of 100 units

Can anybody help me on this please
 
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