18.81% is the change from 420 to 499
Calculation steps:
[( 499 - 420 ) ÷ 420] x 100 = 18.81%
Formula
Percentage change = [(499 - 420) / 420] x 100
Subtract the new number by the original number
499 - 420 = 79
79 ÷ 420 = 0.1880952380952381
0.1880952380952381 x 100 = 18.81%