-37.93% is the change from 646 to 401
Calculation steps:
[( 401 - 646 ) ÷ 646] x 100 = -37.93%
Formula
Percentage change = [(401 - 646) / 646] x 100
Subtract the new number by the original number
401 - 646 = -245
-245 ÷ 646 = -0.37925696594427244
-0.37925696594427244 x 100 = -37.93%