-73.83% is the change from 642 to 168
Calculation steps:
[( 168 - 642 ) ÷ 642] x 100 = -73.83%
Formula
Percentage change = [(168 - 642) / 642] x 100
Subtract the new number by the original number
168 - 642 = -474
-474 ÷ 642 = -0.7383177570093458
-0.7383177570093458 x 100 = -73.83%