-83.95% is the change from 511 to 82
Calculation steps:
[( 82 - 511 ) ÷ 511] x 100 = -83.95%
Formula
Percentage change = [(82 - 511) / 511] x 100
Subtract the new number by the original number
82 - 511 = -429
-429 ÷ 511 = -0.8395303326810176
-0.8395303326810176 x 100 = -83.95%