8.1% is the change from 420 to 454
Calculation steps:
[( 454 - 420 ) ÷ 420] x 100 = 8.1%
Formula
Percentage change = [(454 - 420) / 420] x 100
Subtract the new number by the original number
454 - 420 = 34
34 ÷ 420 = 0.08095238095238096
0.08095238095238096 x 100 = 8.1%