How much should I rep on the benchpress if my maximum is 80 pounds?

I don't know how many reps I should be doing on the bench press. I was able to lift 80 pounds. Now, I don't know if that is good or what. My weight is somewhere between 110 and 120. Any help would be appreciated. Thanks.

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The gym and an article that I read said that was "old school" that girls shouldn't do bench press. I do squats and other exercises. Some girls at my gym are just beginning to do this. This is the reason that I am asking. I don't know a whole lot about it.
How much should I rep on the benchpress if my maximum is 80 pounds?
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