99% is the change from 402 to 800
Calculation steps:
[( 800 - 402 ) ÷ 402] x 100 = 99%
Formula
Percentage change = [(800 - 402) / 402] x 100
Subtract the new number by the original number
800 - 402 = 398
398 ÷ 402 = 0.9900497512437811
0.9900497512437811 x 100 = 99%