99.5% is the change from 402 to 802
Calculation steps:
[( 802 - 402 ) ÷ 402] x 100 = 99.5%
Formula
Percentage change = [(802 - 402) / 402] x 100
Subtract the new number by the original number
802 - 402 = 400
400 ÷ 402 = 0.9950248756218906
0.9950248756218906 x 100 = 99.5%