7.02% is the change from 598 to 640
Calculation steps:
[( 640 - 598 ) ÷ 598] x 100 = 7.02%
Formula
Percentage change = [(640 - 598) / 598] x 100
Subtract the new number by the original number
640 - 598 = 42
42 ÷ 598 = 0.07023411371237458
0.07023411371237458 x 100 = 7.02%