Pick list formula

Pick list formula

Hello,

I'm currently trying to build a simple formula, when I pick an option from a pick list menu, to link it with the corresponding price. An example would be I pick Hot Desk and it gives me price of 199.

The formula looks like this: If(Contains(${Potentials and Members.Type}'Hot Desk'),'199',0).
I was wondering if anyone can help me. Thank you very much.