-79.01% is the change from 405 to 85
Calculation steps:
[( 85 - 405 ) ÷ 405] x 100 = -79.01%
Formula
Percentage change = [(85 - 405) / 405] x 100
Subtract the new number by the original number
85 - 405 = -320
-320 ÷ 405 = -0.7901234567901234
-0.7901234567901234 x 100 = -79.01%