27.74% is the change from 393 to 502
Calculation steps:
[( 502 - 393 ) ÷ 393] x 100 = 27.74%
Formula
Percentage change = [(502 - 393) / 393] x 100
Subtract the new number by the original number
502 - 393 = 109
109 ÷ 393 = 0.27735368956743
0.27735368956743 x 100 = 27.74%
Example