-50% is the change from 222 to 111
Calculation steps:
[( 111 - 222 ) ÷ 222] x 100 = -50%
Formula
Percentage change = [(111 - 222) / 222] x 100
Subtract the new number by the original number
111 - 222 = -111
-111 ÷ 222 = -0.5
-0.5 x 100 = -50%
Example