-32.14% is the change from 420 to 285
Calculation steps:
[( 285 - 420 ) ÷ 420] x 100 = -32.14%
Formula
Percentage change = [(285 - 420) / 420] x 100
Subtract the new number by the original number
285 - 420 = -135
-135 ÷ 420 = -0.32142857142857145
-0.32142857142857145 x 100 = -32.14%