4.75% is the change from 611 to 640
Calculation steps:
[( 640 - 611 ) ÷ 611] x 100 = 4.75%
Formula
Percentage change = [(640 - 611) / 611] x 100
Subtract the new number by the original number
640 - 611 = 29
29 ÷ 611 = 0.04746317512274959
0.04746317512274959 x 100 = 4.75%