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apologiabiology
original number is 100%
100% decreased by 18% means
100% -18%=82%

multiplier is 82% aka 0.82
honeyloop1
If a number decreases by 18% then it is down to 82 % of its value, so your multiplier is 88% written as a decimal number -- 82/100 = 0.82 - not 0.88