-80.41% is the change from 434 to 85
Calculation steps:
[( 85 - 434 ) ÷ 434] x 100 = -80.41%
Formula
Percentage change = [(85 - 434) / 434] x 100
Subtract the new number by the original number
85 - 434 = -349
-349 ÷ 434 = -0.804147465437788
-0.804147465437788 x 100 = -80.41%