-93.13% is the change from 640 to 44
Calculation steps:
[( 44 - 640 ) ÷ 640] x 100 = -93.13%
Formula
Percentage change = [(44 - 640) / 640] x 100
Subtract the new number by the original number
44 - 640 = -596
-596 ÷ 640 = -0.93125
-0.93125 x 100 = -93.13%