-84.15% is the change from 82 to 13
Calculation steps:
[( 13 - 82 ) ÷ 82] x 100 = -84.15%
Formula
Percentage change = [(13 - 82) / 82] x 100
Subtract the new number by the original number
13 - 82 = -69
-69 ÷ 82 = -0.8414634146341463
-0.8414634146341463 x 100 = -84.15%