52.92% is the change from 257 to 393
Calculation steps:
[( 393 - 257 ) ÷ 257] x 100 = 52.92%
Formula
Percentage change = [(393 - 257) / 257] x 100
Subtract the new number by the original number
393 - 257 = 136
136 ÷ 257 = 0.5291828793774319
0.5291828793774319 x 100 = 52.92%