-5.57% is the change from 879 to 830
Calculation steps:
[( 830 - 879 ) ÷ 879] x 100 = -5.57%
Formula
Percentage change = [(830 - 879) / 879] x 100
Subtract the new number by the original number
830 - 879 = -49
-49 ÷ 879 = -0.055745164960182024
-0.055745164960182024 x 100 = -5.57%