-34.52% is the change from 420 to 275
Calculation steps:
[( 275 - 420 ) ÷ 420] x 100 = -34.52%
Formula
Percentage change = [(275 - 420) / 420] x 100
Subtract the new number by the original number
275 - 420 = -145
-145 ÷ 420 = -0.34523809523809523
-0.34523809523809523 x 100 = -34.52%