Dilutions

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Mary1
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Dilutions

I need to make a dilution series. I need to dilute 250 attomoles to 100 attomoles in a final volume of 100 microliters. I understand this dilution series, but need the dilution to be per 25 microliters not per 1 microliter. How do I make the dilution 100 attomoles per 25 microliters?