-11.2% is the change from 991 to 880
Calculation steps:
[( 880 - 991 ) ÷ 991] x 100 = -11.2%
Formula
Percentage change = [(880 - 991) / 991] x 100
Subtract the new number by the original number
880 - 991 = -111
-111 ÷ 991 = -0.11200807265388496
-0.11200807265388496 x 100 = -11.2%