How much to charge for wholesaling

[Nancy Dito]

I have an opportunity to wholesale a very large apt complex. Since this is my first time I do not know how much to charge. Somebody told me .0025 of the sales price, which will generate a very nice figure. I don't want to loose the deal by charging too much but I don't want to be below value either. Is there a formula to figure this out?

Thanks,
Nancy Dito