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    PortPhotos's Avatar
    PortPhotos Posts: 1, Reputation: 1
    New Member

    Jan 3, 2012, 03:17 PM
    Calculate year ago sales from current sales and percent change
    I know this years sales and the % change over Last Year ( it is down) how do I find Last Years sales?
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307

    Jan 4, 2012, 09:18 AM
    Start with the formula for percentage change from one year to the next. If we let be the initial value, and be the value one year later, then the change in sales expressed as a percent of the initial value is then:

    So if you know the percent change p and the value for you can rearrange this to get:

    For example: if and then

    You can check this by substituting this value for back into the first equation and see if it agrees:

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