-80% is the change from 285 to 57
Calculation steps:
[( 57 - 285 ) ÷ 285] x 100 = -80%
Formula
Percentage change = [(57 - 285) / 285] x 100
Subtract the new number by the original number
57 - 285 = -228
-228 ÷ 285 = -0.8
-0.8 x 100 = -80%
Example