Currencies round - that is, if you put 12.345 in, you get $12.35 back. Not sure what the right thing to do is here.
Also, not sure if entering 17 should return 17% or 1700% (current behavior).
Do we really want these cardtypes? they're weird...
view (card) not supported for foocurrency
view (card) not supported for foopercentage
getting rid of these cardtypes for now.