-80% is the change from 430 to 86
Calculation steps:
[( 86 - 430 ) ÷ 430] x 100 = -80%
Formula
Percentage change = [(86 - 430) / 430] x 100
Subtract the new number by the original number
86 - 430 = -344
-344 ÷ 430 = -0.8
-0.8 x 100 = -80%
Example