-60% is the change from 390 to 156
Calculation steps:
[( 156 - 390 ) ÷ 390] x 100 = -60%
Formula
Percentage change = [(156 - 390) / 390] x 100
Subtract the new number by the original number
156 - 390 = -234
-234 ÷ 390 = -0.6
-0.6 x 100 = -60%
Example