-84.17% is the change from 821 to 130
Calculation steps:
[( 130 - 821 ) ÷ 821] x 100 = -84.17%
Formula
Percentage change = [(130 - 821) / 821] x 100
Subtract the new number by the original number
130 - 821 = -691
-691 ÷ 821 = -0.8416565164433617
-0.8416565164433617 x 100 = -84.17%