-2.5% is the change from 880 to 858
Calculation steps:
[( 858 - 880 ) ÷ 880] x 100 = -2.5%
Formula
Percentage change = [(858 - 880) / 880] x 100
Subtract the new number by the original number
858 - 880 = -22
-22 ÷ 880 = -0.025
-0.025 x 100 = -2.5%
Example