Paypal Fees

if the fee is passed to you, it is 2.6% plus $0.30 AUD of the amount you receive. For example, if you are sent $100.00 AUD by credit card, the fee would be $2.90 AUD ($2.60 + $0.30). Sending money – Purchase payments: It's free to use PayPal to purchase goods or services.

recieved.   = $7.15

= 30c

+ 2.6% (7.15) =19c 

total fees for 0.49c

Ebay fees are approx 10% and fee on postage 10% paypal fee aprox 3% so you should add on about 17% to your ebay listing to cover costs

Anthony