-22% is the change from 50 to 39
Calculation steps:
[( 39 - 50 ) ÷ 50] x 100 = -22%
Formula
Percentage change = [(39 - 50) / 50] x 100
Subtract the new number by the original number
39 - 50 = -11
-11 ÷ 50 = -0.22
-0.22 x 100 = -22%
Example