33.42% is the change from 377 to 503
Calculation steps:
[( 503 - 377 ) ÷ 377] x 100 = 33.42%
Formula
Percentage change = [(503 - 377) / 377] x 100
Subtract the new number by the original number
503 - 377 = 126
126 ÷ 377 = 0.33421750663129973
0.33421750663129973 x 100 = 33.42%