-4.05% is the change from 420 to 403
Calculation steps:
[( 403 - 420 ) ÷ 420] x 100 = -4.05%
Formula
Percentage change = [(403 - 420) / 420] x 100
Subtract the new number by the original number
403 - 420 = -17
-17 ÷ 420 = -0.04047619047619048
-0.04047619047619048 x 100 = -4.05%