-50% is the change from 192 to 96
Calculation steps:
[( 96 - 192 ) ÷ 192] x 100 = -50%
Formula
Percentage change = [(96 - 192) / 192] x 100
Subtract the new number by the original number
96 - 192 = -96
-96 ÷ 192 = -0.5
-0.5 x 100 = -50%
Example