-26.62% is the change from 879 to 645
Calculation steps:
[( 645 - 879 ) ÷ 879] x 100 = -26.62%
Formula
Percentage change = [(645 - 879) / 879] x 100
Subtract the new number by the original number
645 - 879 = -234
-234 ÷ 879 = -0.26621160409556316
-0.26621160409556316 x 100 = -26.62%