103.46% is the change from 491 to 999
Calculation steps:
[( 999 - 491 ) ÷ 491] x 100 = 103.46%
Formula
Percentage change = [(999 - 491) / 491] x 100
Subtract the new number by the original number
999 - 491 = 508
508 ÷ 491 = 1.034623217922607
1.034623217922607 x 100 = 103.46%