30.03% is the change from 393 to 511
Calculation steps:
[( 511 - 393 ) ÷ 393] x 100 = 30.03%
Formula
Percentage change = [(511 - 393) / 393] x 100
Subtract the new number by the original number
511 - 393 = 118
118 ÷ 393 = 0.30025445292620867
0.30025445292620867 x 100 = 30.03%