-9.99% is the change from 821 to 739
Calculation steps:
[( 739 - 821 ) ÷ 821] x 100 = -9.99%
Formula
Percentage change = [(739 - 821) / 821] x 100
Subtract the new number by the original number
739 - 821 = -82
-82 ÷ 821 = -0.09987819732034105
-0.09987819732034105 x 100 = -9.99%