-93.98% is the change from 665 to 40
Calculation steps:
[( 40 - 665 ) ÷ 665] x 100 = -93.98%
Formula
Percentage change = [(40 - 665) / 665] x 100
Subtract the new number by the original number
40 - 665 = -625
-625 ÷ 665 = -0.9398496240601504
-0.9398496240601504 x 100 = -93.98%