40000% is the change from 1 to 401
Calculation steps:
[( 401 - 1 ) ÷ 1] x 100 = 40000%
Formula
Percentage change = [(401 - 1) / 1] x 100
Subtract the new number by the original number
401 - 1 = 400
400 ÷ 1 = 400
400 x 100 = 40000%
Example