-79.91% is the change from 423 to 85
Calculation steps:
[( 85 - 423 ) ÷ 423] x 100 = -79.91%
Formula
Percentage change = [(85 - 423) / 423] x 100
Subtract the new number by the original number
85 - 423 = -338
-338 ÷ 423 = -0.7990543735224587
-0.7990543735224587 x 100 = -79.91%