254.58% is the change from 240 to 851
Calculation steps:
[( 851 - 240 ) ÷ 240] x 100 = 254.58%
Formula
Percentage change = [(851 - 240) / 240] x 100
Subtract the new number by the original number
851 - 240 = 611
611 ÷ 240 = 2.5458333333333334
2.5458333333333334 x 100 = 254.58%