27.66% is the change from 394 to 503
Calculation steps:
[( 503 - 394 ) ÷ 394] x 100 = 27.66%
Formula
Percentage change = [(503 - 394) / 394] x 100
Subtract the new number by the original number
503 - 394 = 109
109 ÷ 394 = 0.2766497461928934
0.2766497461928934 x 100 = 27.66%