-43.75% is the change from 640 to 360
Calculation steps:
[( 360 - 640 ) ÷ 640] x 100 = -43.75%
Formula
Percentage change = [(360 - 640) / 640] x 100
Subtract the new number by the original number
360 - 640 = -280
-280 ÷ 640 = -0.4375
-0.4375 x 100 = -43.75%