-12.09% is the change from 728 to 640
Calculation steps:
[( 640 - 728 ) ÷ 728] x 100 = -12.09%
Formula
Percentage change = [(640 - 728) / 728] x 100
Subtract the new number by the original number
640 - 728 = -88
-88 ÷ 728 = -0.12087912087912088
-0.12087912087912088 x 100 = -12.09%