-31.9% is the change from 420 to 286
Calculation steps:
[( 286 - 420 ) ÷ 420] x 100 = -31.9%
Formula
Percentage change = [(286 - 420) / 420] x 100
Subtract the new number by the original number
286 - 420 = -134
-134 ÷ 420 = -0.319047619047619
-0.319047619047619 x 100 = -31.9%