-79.65% is the change from 398 to 81
Calculation steps:
[( 81 - 398 ) ÷ 398] x 100 = -79.65%
Formula
Percentage change = [(81 - 398) / 398] x 100
Subtract the new number by the original number
81 - 398 = -317
-317 ÷ 398 = -0.7964824120603015
-0.7964824120603015 x 100 = -79.65%