-23.89% is the change from 879 to 669
Calculation steps:
[( 669 - 879 ) ÷ 879] x 100 = -23.89%
Formula
Percentage change = [(669 - 879) / 879] x 100
Subtract the new number by the original number
669 - 879 = -210
-210 ÷ 879 = -0.23890784982935154
-0.23890784982935154 x 100 = -23.89%