256.81% is the change from 257 to 917
Calculation steps:
[( 917 - 257 ) ÷ 257] x 100 = 256.81%
Formula
Percentage change = [(917 - 257) / 257] x 100
Subtract the new number by the original number
917 - 257 = 660
660 ÷ 257 = 2.568093385214008
2.568093385214008 x 100 = 256.81%