6.4% is the change from 625 to 665
Calculation steps:
[( 665 - 625 ) ÷ 625] x 100 = 6.4%
Formula
Percentage change = [(665 - 625) / 625] x 100
Subtract the new number by the original number
665 - 625 = 40
40 ÷ 625 = 0.064
0.064 x 100 = 6.4%
Example