-87.21% is the change from 821 to 105
Calculation steps:
[( 105 - 821 ) ÷ 821] x 100 = -87.21%
Formula
Percentage change = [(105 - 821) / 821] x 100
Subtract the new number by the original number
105 - 821 = -716
-716 ÷ 821 = -0.8721071863580999
-0.8721071863580999 x 100 = -87.21%