-93.61% is the change from 657 to 42
Calculation steps:
[( 42 - 657 ) ÷ 657] x 100 = -93.61%
Formula
Percentage change = [(42 - 657) / 657] x 100
Subtract the new number by the original number
42 - 657 = -615
-615 ÷ 657 = -0.9360730593607306
-0.9360730593607306 x 100 = -93.61%