-50% is the change from 38 to 19
Calculation steps:
[( 19 - 38 ) ÷ 38] x 100 = -50%
Formula
Percentage change = [(19 - 38) / 38] x 100
Subtract the new number by the original number
19 - 38 = -19
-19 ÷ 38 = -0.5
-0.5 x 100 = -50%
Example