-94.12% is the change from 680 to 40
Calculation steps:
[( 40 - 680 ) ÷ 680] x 100 = -94.12%
Formula
Percentage change = [(40 - 680) / 680] x 100
Subtract the new number by the original number
40 - 680 = -640
-640 ÷ 680 = -0.9411764705882353
-0.9411764705882353 x 100 = -94.12%