-21.69% is the change from 650 to 509
Calculation steps:
[( 509 - 650 ) ÷ 650] x 100 = -21.69%
Formula
Percentage change = [(509 - 650) / 650] x 100
Subtract the new number by the original number
509 - 650 = -141
-141 ÷ 650 = -0.2169230769230769
-0.2169230769230769 x 100 = -21.69%