-99.01% is the change from 405 to 4
Calculation steps:
[( 4 - 405 ) ÷ 405] x 100 = -99.01%
Formula
Percentage change = [(4 - 405) / 405] x 100
Subtract the new number by the original number
4 - 405 = -401
-401 ÷ 405 = -0.9901234567901235
-0.9901234567901235 x 100 = -99.01%