42.86% is the change from 420 to 600
Calculation steps:
[( 600 - 420 ) ÷ 420] x 100 = 42.86%
Formula
Percentage change = [(600 - 420) / 420] x 100
Subtract the new number by the original number
600 - 420 = 180
180 ÷ 420 = 0.42857142857142855
0.42857142857142855 x 100 = 42.86%