-96.71% is the change from 821 to 27
Calculation steps:
[( 27 - 821 ) ÷ 821] x 100 = -96.71%
Formula
Percentage change = [(27 - 821) / 821] x 100
Subtract the new number by the original number
27 - 821 = -794
-794 ÷ 821 = -0.9671132764920828
-0.9671132764920828 x 100 = -96.71%