99.75% is the change from 401 to 801
Calculation steps:
[( 801 - 401 ) ÷ 401] x 100 = 99.75%
Formula
Percentage change = [(801 - 401) / 401] x 100
Subtract the new number by the original number
801 - 401 = 400
400 ÷ 401 = 0.9975062344139651
0.9975062344139651 x 100 = 99.75%