-93.68% is the change from 665 to 42
Calculation steps:
[( 42 - 665 ) ÷ 665] x 100 = -93.68%
Formula
Percentage change = [(42 - 665) / 665] x 100
Subtract the new number by the original number
42 - 665 = -623
-623 ÷ 665 = -0.9368421052631579
-0.9368421052631579 x 100 = -93.68%