-52.74% is the change from 821 to 388
Calculation steps:
[( 388 - 821 ) ÷ 821] x 100 = -52.74%
Formula
Percentage change = [(388 - 821) / 821] x 100
Subtract the new number by the original number
388 - 821 = -433
-433 ÷ 821 = -0.5274056029232643
-0.5274056029232643 x 100 = -52.74%