48.38% is the change from 339 to 503
Calculation steps:
[( 503 - 339 ) ÷ 339] x 100 = 48.38%
Formula
Percentage change = [(503 - 339) / 339] x 100
Subtract the new number by the original number
503 - 339 = 164
164 ÷ 339 = 0.4837758112094395
0.4837758112094395 x 100 = 48.38%