259.61% is the change from 255 to 917
Calculation steps:
[( 917 - 255 ) ÷ 255] x 100 = 259.61%
Formula
Percentage change = [(917 - 255) / 255] x 100
Subtract the new number by the original number
917 - 255 = 662
662 ÷ 255 = 2.596078431372549
2.596078431372549 x 100 = 259.61%