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Hi Karen, If you sold 50 items one month and 70 the next month then the percentage change is
Since this is positive there is a 40% increase. If, as in your second example the sales go from 5251 to 651 then the percentage change is
Since this number is negative there is an 87.6% decrease. If a quantity starts at some level a and changes to a second level b then the percentage change is
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