19.48% is the change from 421 to 503
Calculation steps:
[( 503 - 421 ) ÷ 421] x 100 = 19.48%
Formula
Percentage change = [(503 - 421) / 421] x 100
Subtract the new number by the original number
503 - 421 = 82
82 ÷ 421 = 0.19477434679334918
0.19477434679334918 x 100 = 19.48%