-35% is the change from 420 to 273
Calculation steps:
[( 273 - 420 ) ÷ 420] x 100 = -35%
Formula
Percentage change = [(273 - 420) / 420] x 100
Subtract the new number by the original number
273 - 420 = -147
-147 ÷ 420 = -0.35
-0.35 x 100 = -35%
Example