4.68% is the change from 641 to 671
Calculation steps:
[( 671 - 641 ) ÷ 641] x 100 = 4.68%
Formula
Percentage change = [(671 - 641) / 641] x 100
Subtract the new number by the original number
671 - 641 = 30
30 ÷ 641 = 0.046801872074883
0.046801872074883 x 100 = 4.68%