-75% is the change from 156 to 39
Calculation steps:
[( 39 - 156 ) ÷ 156] x 100 = -75%
Formula
Percentage change = [(39 - 156) / 156] x 100
Subtract the new number by the original number
39 - 156 = -117
-117 ÷ 156 = -0.75
-0.75 x 100 = -75%
Example