How do I account for realtor's 3% fee when calculating offer?

[Vintus Okonkwo]

I began working with an investor friendly realtor and she's asking for a 3% fee. Is that an ok fee? Also, how do I take this fee into consideration when making an offer?

Is the fee 3% ARV or 3% of the purchase price? Sorry I don't want to sound like an absolute newbie when I go over this with her!

Thank you!