-20% is the change from 680 to 544
Calculation steps:
[( 544 - 680 ) ÷ 680] x 100 = -20%
Formula
Percentage change = [(544 - 680) / 680] x 100
Subtract the new number by the original number
544 - 680 = -136
-136 ÷ 680 = -0.2
-0.2 x 100 = -20%
Example