I can do this for 18% which ever you prefer since I have never traded with you before.
I am confused, so I pay $15 worth of bitcoin + 18% for your $15 PayPal?
No. 18% of going rate from whatever exchange you want to use. Just multiply that amount by 18% and add that on top of it. Member who offered you +5 on top of that rate(1:1) has the right idea

But he is taking a risk trading with no previous feedback and high chance of chargeback for only 5%
