-3.3% is the change from 879 to 850
Calculation steps:
[( 850 - 879 ) ÷ 879] x 100 = -3.3%
Formula
Percentage change = [(850 - 879) / 879] x 100
Subtract the new number by the original number
850 - 879 = -29
-29 ÷ 879 = -0.03299203640500569
-0.03299203640500569 x 100 = -3.3%