-84.15% is the change from 820 to 130
Calculation steps:
[( 130 - 820 ) ÷ 820] x 100 = -84.15%
Formula
Percentage change = [(130 - 820) / 820] x 100
Subtract the new number by the original number
130 - 820 = -690
-690 ÷ 820 = -0.8414634146341463
-0.8414634146341463 x 100 = -84.15%