33.07% is the change from 378 to 503
Calculation steps:
[( 503 - 378 ) ÷ 378] x 100 = 33.07%
Formula
Percentage change = [(503 - 378) / 378] x 100
Subtract the new number by the original number
503 - 378 = 125
125 ÷ 378 = 0.3306878306878307
0.3306878306878307 x 100 = 33.07%