-9.99% is the change from 921 to 829
Calculation steps:
[( 829 - 921 ) ÷ 921] x 100 = -9.99%
Formula
Percentage change = [(829 - 921) / 921] x 100
Subtract the new number by the original number
829 - 921 = -92
-92 ÷ 921 = -0.0998914223669924
-0.0998914223669924 x 100 = -9.99%