250.97% is the change from 257 to 902
Calculation steps:
[( 902 - 257 ) ÷ 257] x 100 = 250.97%
Formula
Percentage change = [(902 - 257) / 257] x 100
Subtract the new number by the original number
902 - 257 = 645
645 ÷ 257 = 2.509727626459144
2.509727626459144 x 100 = 250.97%