-23.78% is the change from 879 to 670
Calculation steps:
[( 670 - 879 ) ÷ 879] x 100 = -23.78%
Formula
Percentage change = [(670 - 879) / 879] x 100
Subtract the new number by the original number
670 - 879 = -209
-209 ÷ 879 = -0.23777019340159272
-0.23777019340159272 x 100 = -23.78%