-39.85% is the change from 650 to 391
Calculation steps:
[( 391 - 650 ) ÷ 650] x 100 = -39.85%
Formula
Percentage change = [(391 - 650) / 650] x 100
Subtract the new number by the original number
391 - 650 = -259
-259 ÷ 650 = -0.3984615384615385
-0.3984615384615385 x 100 = -39.85%