Actually I think we're in agreement here: I didn't make it clear but the nominal figure to which I was referring was the magnitude claimed free. By saying "extr

Actually I think we're in agreement here: I didn't make it clear but the nominal figure to which I was referring was the magnitude claimed free. By saying "extra free" they get to write down 10% instead of 9%. I also agree the difference is small in this case but I'd argue: * Small wins are still wins. * The difference is not so small with bigger percentages. Imagine I decide to tweak my margins for a time and sell 1.5Kg of cereal for the price I previously sold 1Kg. I could say "33% free" (relative to old price) or "50% extra free".