99.5% is the change from 403 to 804
Calculation steps:
[( 804 - 403 ) ÷ 403] x 100 = 99.5%
Formula
Percentage change = [(804 - 403) / 403] x 100
Subtract the new number by the original number
804 - 403 = 401
401 ÷ 403 = 0.9950372208436724
0.9950372208436724 x 100 = 99.5%