-4.35% is the change from 920 to 880
Calculation steps:
[( 880 - 920 ) ÷ 920] x 100 = -4.35%
Formula
Percentage change = [(880 - 920) / 920] x 100
Subtract the new number by the original number
880 - 920 = -40
-40 ÷ 920 = -0.043478260869565216
-0.043478260869565216 x 100 = -4.35%