-93.74% is the change from 671 to 42
Calculation steps:
[( 42 - 671 ) ÷ 671] x 100 = -93.74%
Formula
Percentage change = [(42 - 671) / 671] x 100
Subtract the new number by the original number
42 - 671 = -629
-629 ÷ 671 = -0.9374068554396423
-0.9374068554396423 x 100 = -93.74%