99% is the change from 500 to 995
Calculation steps:
[( 995 - 500 ) ÷ 500] x 100 = 99%
Formula
Percentage change = [(995 - 500) / 500] x 100
Subtract the new number by the original number
995 - 500 = 495
495 ÷ 500 = 0.99
0.99 x 100 = 99%
Example