-81.08% is the change from 650 to 123
Calculation steps:
[( 123 - 650 ) ÷ 650] x 100 = -81.08%
Formula
Percentage change = [(123 - 650) / 650] x 100
Subtract the new number by the original number
123 - 650 = -527
-527 ÷ 650 = -0.8107692307692308
-0.8107692307692308 x 100 = -81.08%