258.58% is the change from 239 to 857
Calculation steps:
[( 857 - 239 ) ÷ 239] x 100 = 258.58%
Formula
Percentage change = [(857 - 239) / 239] x 100
Subtract the new number by the original number
857 - 239 = 618
618 ÷ 239 = 2.585774058577406
2.585774058577406 x 100 = 258.58%