The percentage is 100 times [ y/x - 1] .
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To find percentage accuracy: (x-y)/x Where x > y This will show as a % how far y is from x.
X as a percentage of Y = 100*X/Y.
if x and y are fractions then x*y If they are expressed as percentages of 100 then (x/100)*y
If a variable goes from X to Y, change = Y-X.The absolute change = Y-X or X-Y, whichever is positive.The percentage change = 100*Change/X = 100*(Y-X)/X or 100*(Y/X - 1)
The percentage increase (or decrease) from "a" to "b" is:((b - a) / a) x 100 Equivalent to: (b/a - 1) x 100 In other words, you calculate the difference between the two values, and compare with the first one.