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Richard Koch 80/20 Principle, Science of Being Great, 360 DEGREE 3 Books Set PercyJacksonGraphicNovels she makes a living killingDescription Condition: BRAND NEW Format: Paperback The 80 20 Principle: Achieve More with Less: THE PROVEN WAY TO VASTLY INCREASE PRODUCTIVITY, EFFECTIVENESS AND SUCCESS.. Millions of highly effective people have become more successful by understanding the simple fact that 80% of your results come from 20% of your efforts. All you have to do is identify the 20 percent that leads to 80 percent. The 80 20 Principle shows you how. Richard Koch's million