-36.76% is the change from 642 to 406
Calculation steps:
[( 406 - 642 ) ÷ 642] x 100 = -36.76%
Formula
Percentage change = [(406 - 642) / 642] x 100
Subtract the new number by the original number
406 - 642 = -236
-236 ÷ 642 = -0.367601246105919
-0.367601246105919 x 100 = -36.76%