40400% is the change from 1 to 405
Calculation steps:
[( 405 - 1 ) ÷ 1] x 100 = 40400%
Formula
Percentage change = [(405 - 1) / 1] x 100
Subtract the new number by the original number
405 - 1 = 404
404 ÷ 1 = 404
404 x 100 = 40400%
Example