100% is the change from 401 to 802
Calculation steps:
[( 802 - 401 ) ÷ 401] x 100 = 100%
Formula
Percentage change = [(802 - 401) / 401] x 100
Subtract the new number by the original number
802 - 401 = 401
401 ÷ 401 = 1
1 x 100 = 100%
Example