99.2% is the change from 502 to 1000
Calculation steps:
[( 1000 - 502 ) ÷ 502] x 100 = 99.2%
Formula
Percentage change = [(1000 - 502) / 502] x 100
Subtract the new number by the original number
1000 - 502 = 498
498 ÷ 502 = 0.9920318725099602
0.9920318725099602 x 100 = 99.2%