-87.08% is the change from 650 to 84
Calculation steps:
[( 84 - 650 ) ÷ 650] x 100 = -87.08%
Formula
Percentage change = [(84 - 650) / 650] x 100
Subtract the new number by the original number
84 - 650 = -566
-566 ÷ 650 = -0.8707692307692307
-0.8707692307692307 x 100 = -87.08%