67.7% is the change from 257 to 431
Calculation steps:
[( 431 - 257 ) ÷ 257] x 100 = 67.7%
Formula
Percentage change = [(431 - 257) / 257] x 100
Subtract the new number by the original number
431 - 257 = 174
174 ÷ 257 = 0.6770428015564203
0.6770428015564203 x 100 = 67.7%