-79.57% is the change from 421 to 86
Calculation steps:
[( 86 - 421 ) ÷ 421] x 100 = -79.57%
Formula
Percentage change = [(86 - 421) / 421] x 100
Subtract the new number by the original number
86 - 421 = -335
-335 ÷ 421 = -0.7957244655581948
-0.7957244655581948 x 100 = -79.57%