-63.1% is the change from 420 to 155
Calculation steps:
[( 155 - 420 ) ÷ 420] x 100 = -63.1%
Formula
Percentage change = [(155 - 420) / 420] x 100
Subtract the new number by the original number
155 - 420 = -265
-265 ÷ 420 = -0.6309523809523809
-0.6309523809523809 x 100 = -63.1%