46.22% is the change from 344 to 503
Calculation steps:
[( 503 - 344 ) ÷ 344] x 100 = 46.22%
Formula
Percentage change = [(503 - 344) / 344] x 100
Subtract the new number by the original number
503 - 344 = 159
159 ÷ 344 = 0.4622093023255814
0.4622093023255814 x 100 = 46.22%