98.83% is the change from 256 to 509
Calculation steps:
[( 509 - 256 ) ÷ 256] x 100 = 98.83%
Formula
Percentage change = [(509 - 256) / 256] x 100
Subtract the new number by the original number
509 - 256 = 253
253 ÷ 256 = 0.98828125
0.98828125 x 100 = 98.83%