-29.47% is the change from 879 to 620
Calculation steps:
[( 620 - 879 ) ÷ 879] x 100 = -29.47%
Formula
Percentage change = [(620 - 879) / 879] x 100
Subtract the new number by the original number
620 - 879 = -259
-259 ÷ 879 = -0.29465301478953354
-0.29465301478953354 x 100 = -29.47%