-5.24% is the change from 420 to 398
Calculation steps:
[( 398 - 420 ) ÷ 420] x 100 = -5.24%
Formula
Percentage change = [(398 - 420) / 420] x 100
Subtract the new number by the original number
398 - 420 = -22
-22 ÷ 420 = -0.05238095238095238
-0.05238095238095238 x 100 = -5.24%