9.03% is the change from 587 to 640
Calculation steps:
[( 640 - 587 ) ÷ 587] x 100 = 9.03%
Formula
Percentage change = [(640 - 587) / 587] x 100
Subtract the new number by the original number
640 - 587 = 53
53 ÷ 587 = 0.09028960817717206
0.09028960817717206 x 100 = 9.03%