99.21% is the change from 254 to 506
Calculation steps:
[( 506 - 254 ) ÷ 254] x 100 = 99.21%
Formula
Percentage change = [(506 - 254) / 254] x 100
Subtract the new number by the original number
506 - 254 = 252
252 ÷ 254 = 0.9921259842519685
0.9921259842519685 x 100 = 99.21%