9.06% is the change from 640 to 698
Calculation steps:
[( 698 - 640 ) ÷ 640] x 100 = 9.06%
Formula
Percentage change = [(698 - 640) / 640] x 100
Subtract the new number by the original number
698 - 640 = 58
58 ÷ 640 = 0.090625
0.090625 x 100 = 9.06%
Example