101.25% is the change from 400 to 805
Calculation steps:
[( 805 - 400 ) ÷ 400] x 100 = 101.25%
Formula
Percentage change = [(805 - 400) / 400] x 100
Subtract the new number by the original number
805 - 400 = 405
405 ÷ 400 = 1.0125
1.0125 x 100 = 101.25%