-37.54% is the change from 642 to 401
Calculation steps:
[( 401 - 642 ) ÷ 642] x 100 = -37.54%
Formula
Percentage change = [(401 - 642) / 642] x 100
Subtract the new number by the original number
401 - 642 = -241
-241 ÷ 642 = -0.37538940809968846
-0.37538940809968846 x 100 = -37.54%