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Now I understand - nobody understands. Half of one percent is 0.5% which is the same as half a percent (a percent being one percent being 1%). You see, one is one whether it is a kilo a stone or percent (yes, one hundreth of the whole). Half of one is a half is 0.5. If you reduce something by half a percent then it is 0.5% less than it was before - yes, if 1% has been reduced by 0.5% then strictly speaking it is 0.995% but the rate was reduced to half of what it was so reduced by 50%. It was reduced to half a percent, 0.5% (yes, which is half of one). However, when people tell me they have lost half a stone then I get seriously worried because half a stone is actually just a stone that is half the size of what it used to be. For what reason did they halve it and how did they come to lose one half - where is the other half for comparison purposes and where do you start looking for the lost half ......but that is another story.