7.38% is the change from 596 to 640
Calculation steps:
[( 640 - 596 ) ÷ 596] x 100 = 7.38%
Formula
Percentage change = [(640 - 596) / 596] x 100
Subtract the new number by the original number
640 - 596 = 44
44 ÷ 596 = 0.0738255033557047
0.0738255033557047 x 100 = 7.38%