-26.47% is the change from 680 to 500
Calculation steps:
[( 500 - 680 ) ÷ 680] x 100 = -26.47%
Formula
Percentage change = [(500 - 680) / 680] x 100
Subtract the new number by the original number
500 - 680 = -180
-180 ÷ 680 = -0.2647058823529412
-0.2647058823529412 x 100 = -26.47%