63.81% is the change from 257 to 421
Calculation steps:
[( 421 - 257 ) ÷ 257] x 100 = 63.81%
Formula
Percentage change = [(421 - 257) / 257] x 100
Subtract the new number by the original number
421 - 257 = 164
164 ÷ 257 = 0.6381322957198443
0.6381322957198443 x 100 = 63.81%