-31.79% is the change from 390 to 266
Calculation steps:
[( 266 - 390 ) ÷ 390] x 100 = -31.79%
Formula
Percentage change = [(266 - 390) / 390] x 100
Subtract the new number by the original number
266 - 390 = -124
-124 ÷ 390 = -0.31794871794871793
-0.31794871794871793 x 100 = -31.79%