if starting an online business how much do companies charge to do credit card transactions for you online. lets say i sell something for 100 dollars, how much would i come away with if someone pays me with a credit card over the internet or phone, vs jsut coming into my shop and handing me 100 dollars cash. i ask becuse i am considering doing a part time business to see if i can help my own bank account some, and trying to calculate cost and how much i need to sell for. please no responses about bs work at home scams, that is not waht i am doing.