I know marketing directors of large retailers who can't figure out what 10% off a figure is, and get confused as to which is gross and which is net. End up expl

I know marketing directors of large retailers who can't figure out what 10% off a figure is, and get confused as to which is gross and which is net. End up explaining VAT at least once a week. It's cool to be innumerate, though, and if you can't do this stuff yourself there's always a nerd to blame somewhere nearby.