-80% is the change from 650 to 130
Calculation steps:
[( 130 - 650 ) ÷ 650] x 100 = -80%
Formula
Percentage change = [(130 - 650) / 650] x 100
Subtract the new number by the original number
130 - 650 = -520
-520 ÷ 650 = -0.8
-0.8 x 100 = -80%
Example