99.61% is the change from 254 to 507
Calculation steps:
[( 507 - 254 ) ÷ 254] x 100 = 99.61%
Formula
Percentage change = [(507 - 254) / 254] x 100
Subtract the new number by the original number
507 - 254 = 253
253 ÷ 254 = 0.9960629921259843
0.9960629921259843 x 100 = 99.61%