-50% is the change from 388 to 194
Calculation steps:
[( 194 - 388 ) ÷ 388] x 100 = -50%
Formula
Percentage change = [(194 - 388) / 388] x 100
Subtract the new number by the original number
194 - 388 = -194
-194 ÷ 388 = -0.5
-0.5 x 100 = -50%
Example