-79.45% is the change from 399 to 82
Calculation steps:
[( 82 - 399 ) ÷ 399] x 100 = -79.45%
Formula
Percentage change = [(82 - 399) / 399] x 100
Subtract the new number by the original number
82 - 399 = -317
-317 ÷ 399 = -0.7944862155388471
-0.7944862155388471 x 100 = -79.45%