53.31% is the change from 257 to 394
Calculation steps:
[( 394 - 257 ) ÷ 257] x 100 = 53.31%
Formula
Percentage change = [(394 - 257) / 257] x 100
Subtract the new number by the original number
394 - 257 = 137
137 ÷ 257 = 0.5330739299610895
0.5330739299610895 x 100 = 53.31%