-86.77% is the change from 620 to 82
Calculation steps:
[( 82 - 620 ) ÷ 620] x 100 = -86.77%
Formula
Percentage change = [(82 - 620) / 620] x 100
Subtract the new number by the original number
82 - 620 = -538
-538 ÷ 620 = -0.867741935483871
-0.867741935483871 x 100 = -86.77%