That would depend, I suppose, upon how you are defining "increase". If you are referring to "number of different items in stock", then the increase would be five hundred percent. If you are referring to anything else (total quantity of all items in stock, transactions, profits, etc, etc), then other information would be needed.
It would help to have the actual text of and instructions for the exercise on which you are working, so we could "see" what is meant in this case.
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