-39.24% is the change from 660 to 401
Calculation steps:
[( 401 - 660 ) ÷ 660] x 100 = -39.24%
Formula
Percentage change = [(401 - 660) / 660] x 100
Subtract the new number by the original number
401 - 660 = -259
-259 ÷ 660 = -0.3924242424242424
-0.3924242424242424 x 100 = -39.24%