The prices for/on my designs are based on two things:
PayPal charges me (around $0.03 - $0.05) to accept and transfer the money. I try to cover this fee by adding to the cents section of my prices.
Example: If I charge you $2, I only get around $1.97 for my designs. I’d like to receive at least $2, so I had to add a cent amount to cover the fee