256.47% is the change from 255 to 909
Calculation steps:
[( 909 - 255 ) ÷ 255] x 100 = 256.47%
Formula
Percentage change = [(909 - 255) / 255] x 100
Subtract the new number by the original number
909 - 255 = 654
654 ÷ 255 = 2.5647058823529414
2.5647058823529414 x 100 = 256.47%