Can anyone help me with this?

[Hyperion]

It's sort of a math riddle? I believe I"m over-thinking it. I feel so stupid...this is why I wasn't crazy about professor Layton.

A dealer bought an item for $7, sold it for $8, bought it back for $9, and sold it for $10. How much profit did she make.

Thanks in advance. I know VGchartz has some brilliant minds :)

 

NVM. I think I got it. It was stupid of me to put it here. x] Can I delete my own thread? Sorry