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    Our maths teacher gave us a test and never told us we had it!! How do you work out percentage increase and decrease?...?.??
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    To calculate percentage decrease:

    First: work out the difference (decrease) between the two numbers you are comparing.
    Decrease = Original Number - New Number
    Then: divide the decrease by the original number and multiply the answer by 100.
    % Decrease = Decrease ÷ Original Number × 100
    If your answer is a negative number then this is a percentage increase.
    If you wish to calculate the percentage increase or decrease of several numbers then we recommend using the first formula. Positive values indicate a percentage increase whereas negative values indicate percentage decrease.

    https://www.skillsyouneed.com/num/percent-change.html
 
 
 
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