5.47% is the change from 640 to 675
Calculation steps:
[( 675 - 640 ) ÷ 640] x 100 = 5.47%
Formula
Percentage change = [(675 - 640) / 640] x 100
Subtract the new number by the original number
675 - 640 = 35
35 ÷ 640 = 0.0546875
0.0546875 x 100 = 5.47%