-89.79% is the change from 979 to 100
Calculation steps:
[( 100 - 979 ) ÷ 979] x 100 = -89.79%
Formula
Percentage change = [(100 - 979) / 979] x 100
Subtract the new number by the original number
100 - 979 = -879
-879 ÷ 979 = -0.8978549540347294
-0.8978549540347294 x 100 = -89.79%