96.27% is the change from 509 to 999
Calculation steps:
[( 999 - 509 ) ÷ 509] x 100 = 96.27%
Formula
Percentage change = [(999 - 509) / 509] x 100
Subtract the new number by the original number
999 - 509 = 490
490 ÷ 509 = 0.962671905697446
0.962671905697446 x 100 = 96.27%