-36.92% is the change from 642 to 405
Calculation steps:
[( 405 - 642 ) ÷ 642] x 100 = -36.92%
Formula
Percentage change = [(405 - 642) / 642] x 100
Subtract the new number by the original number
405 - 642 = -237
-237 ÷ 642 = -0.3691588785046729
-0.3691588785046729 x 100 = -36.92%