-15.48% is the change from 420 to 355
Calculation steps:
[( 355 - 420 ) ÷ 420] x 100 = -15.48%
Formula
Percentage change = [(355 - 420) / 420] x 100
Subtract the new number by the original number
355 - 420 = -65
-65 ÷ 420 = -0.15476190476190477
-0.15476190476190477 x 100 = -15.48%