-52.01% is the change from 821 to 394
Calculation steps:
[( 394 - 821 ) ÷ 821] x 100 = -52.01%
Formula
Percentage change = [(394 - 821) / 821] x 100
Subtract the new number by the original number
394 - 821 = -427
-427 ÷ 821 = -0.5200974421437271
-0.5200974421437271 x 100 = -52.01%