32.57% is the change from 393 to 521
Calculation steps:
[( 521 - 393 ) ÷ 393] x 100 = 32.57%
Formula
Percentage change = [(521 - 393) / 393] x 100
Subtract the new number by the original number
521 - 393 = 128
128 ÷ 393 = 0.3256997455470738
0.3256997455470738 x 100 = 32.57%