18.91% is the change from 423 to 503
Calculation steps:
[( 503 - 423 ) ÷ 423] x 100 = 18.91%
Formula
Percentage change = [(503 - 423) / 423] x 100
Subtract the new number by the original number
503 - 423 = 80
80 ÷ 423 = 0.18912529550827423
0.18912529550827423 x 100 = 18.91%