231.13% is the change from 257 to 851
Calculation steps:
[( 851 - 257 ) ÷ 257] x 100 = 231.13%
Formula
Percentage change = [(851 - 257) / 257] x 100
Subtract the new number by the original number
851 - 257 = 594
594 ÷ 257 = 2.311284046692607
2.311284046692607 x 100 = 231.13%