-81.78% is the change from 450 to 82
Calculation steps:
[( 82 - 450 ) ÷ 450] x 100 = -81.78%
Formula
Percentage change = [(82 - 450) / 450] x 100
Subtract the new number by the original number
82 - 450 = -368
-368 ÷ 450 = -0.8177777777777778
-0.8177777777777778 x 100 = -81.78%