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Set up all percentage problems this way: Part/whole = %/100 = is/of You must know 2 of these three (part, whole, % -- 100 is constant.) What is 25% of 80? (we don't know the part) x/80 = 25/100 x = (80*25)/100 = 2000/100 = 20 40 is what percent of 160? (we don't know the %) 40/160 = x/100 x = (40*100)/160 = 4000/160 = 25% 36 is 75% of what? (we don't know the whole) 36/x = 75/100 x = (36*100)/75 x = 48