-36.29% is the change from 642 to 409
Calculation steps:
[( 409 - 642 ) ÷ 642] x 100 = -36.29%
Formula
Percentage change = [(409 - 642) / 642] x 100
Subtract the new number by the original number
409 - 642 = -233
-233 ÷ 642 = -0.3629283489096573
-0.3629283489096573 x 100 = -36.29%