-90% is the change from 880 to 88
Calculation steps:
[( 88 - 880 ) ÷ 880] x 100 = -90%
Formula
Percentage change = [(88 - 880) / 880] x 100
Subtract the new number by the original number
88 - 880 = -792
-792 ÷ 880 = -0.9
-0.9 x 100 = -90%
Example