-41.27% is the change from 664 to 390
Calculation steps:
[( 390 - 664 ) ÷ 664] x 100 = -41.27%
Formula
Percentage change = [(390 - 664) / 664] x 100
Subtract the new number by the original number
390 - 664 = -274
-274 ÷ 664 = -0.4126506024096386
-0.4126506024096386 x 100 = -41.27%