-78.32% is the change from 821 to 178
Calculation steps:
[( 178 - 821 ) ÷ 821] x 100 = -78.32%
Formula
Percentage change = [(178 - 821) / 821] x 100
Subtract the new number by the original number
178 - 821 = -643
-643 ÷ 821 = -0.7831912302070646
-0.7831912302070646 x 100 = -78.32%