Answer: hope this helps :)
Calculating Percentage Change Step-by-Step
To calculate a percentage increase, first work out the difference (increase) between the two numbers you are comparing:
Increase = New Number - Original Number
Next, divide the increase by the original number and multiply the answer by 100:
% increase = Increase ÷ Original Number × 100.
If the answer is a negative number, that means the percentage change is a decrease.