64.59% is the change from 257 to 423
Calculation steps:
[( 423 - 257 ) ÷ 257] x 100 = 64.59%
Formula
Percentage change = [(423 - 257) / 257] x 100
Subtract the new number by the original number
423 - 257 = 166
166 ÷ 257 = 0.6459143968871596
0.6459143968871596 x 100 = 64.59%