Sorry maxymoo, I'm not trying to get at you here, but as Maths teacher it worries me that we teach children/young people every year in junior school and secondary school how to work out percentages and yet every year, when I get a new class, whether they are aged 11 or 16, students just seem to have no idea about percentages. Something is going wrong somewhere in the system.
We hear percentages being quoted regularly on TV ( inflation at 5%, goods advertised at 25% off, surveys saying 70% of people support policy X), but if school leavers are anything to go by, I'm pretty sure a fairly large proportion of the adult population have little idea of what the figures mean