18.68% is the change from 423 to 502
Calculation steps:
[( 502 - 423 ) ÷ 423] x 100 = 18.68%
Formula
Percentage change = [(502 - 423) / 423] x 100
Subtract the new number by the original number
502 - 423 = 79
79 ÷ 423 = 0.1867612293144208
0.1867612293144208 x 100 = 18.68%