-30.72% is the change from 879 to 609
Calculation steps:
[( 609 - 879 ) ÷ 879] x 100 = -30.72%
Formula
Percentage change = [(609 - 879) / 879] x 100
Subtract the new number by the original number
609 - 879 = -270
-270 ÷ 879 = -0.30716723549488056
-0.30716723549488056 x 100 = -30.72%