I'm Sure This Has Been Asked Before

[Quasimodem]

Drinking Still.

I'm not at all pleased that I remember this but,

There is no such thing as 100% mark-up. Mark-up is expressed as a fraction (%) of the selling price, ie profit.

Gauche

Edited to include smiley

Now that you mention it, I think I should have said 10,000% mark-up

MATHGIRL!!!