99.5% is the change from 404 to 806
Calculation steps:
[( 806 - 404 ) ÷ 404] x 100 = 99.5%
Formula
Percentage change = [(806 - 404) / 404] x 100
Subtract the new number by the original number
806 - 404 = 402
402 ÷ 404 = 0.995049504950495
0.995049504950495 x 100 = 99.5%