55.47% is the change from 640 to 995
Calculation steps:
[( 995 - 640 ) ÷ 640] x 100 = 55.47%
Formula
Percentage change = [(995 - 640) / 640] x 100
Subtract the new number by the original number
995 - 640 = 355
355 ÷ 640 = 0.5546875
0.5546875 x 100 = 55.47%