104.5% is the change from 400 to 818
Calculation steps:
[( 818 - 400 ) ÷ 400] x 100 = 104.5%
Formula
Percentage change = [(818 - 400) / 400] x 100
Subtract the new number by the original number
818 - 400 = 418
418 ÷ 400 = 1.045
1.045 x 100 = 104.5%
Example