-10.21% is the change from 979 to 879
Calculation steps:
[( 879 - 979 ) ÷ 979] x 100 = -10.21%
Formula
Percentage change = [(879 - 979) / 979] x 100
Subtract the new number by the original number
879 - 979 = -100
-100 ÷ 979 = -0.10214504596527069
-0.10214504596527069 x 100 = -10.21%