29.52% is the change from 393 to 509
Calculation steps:
[( 509 - 393 ) ÷ 393] x 100 = 29.52%
Formula
Percentage change = [(509 - 393) / 393] x 100
Subtract the new number by the original number
509 - 393 = 116
116 ÷ 393 = 0.2951653944020356
0.2951653944020356 x 100 = 29.52%