5.94% is the change from 640 to 678
Calculation steps:
[( 678 - 640 ) ÷ 640] x 100 = 5.94%
Formula
Percentage change = [(678 - 640) / 640] x 100
Subtract the new number by the original number
678 - 640 = 38
38 ÷ 640 = 0.059375
0.059375 x 100 = 5.94%
Example