7.74% is the change from 620 to 668
Calculation steps:
[( 668 - 620 ) ÷ 620] x 100 = 7.74%
Formula
Percentage change = [(668 - 620) / 620] x 100
Subtract the new number by the original number
668 - 620 = 48
48 ÷ 620 = 0.07741935483870968
0.07741935483870968 x 100 = 7.74%