7.94% is the change from 630 to 680
Calculation steps:
[( 680 - 630 ) ÷ 630] x 100 = 7.94%
Formula
Percentage change = [(680 - 630) / 630] x 100
Subtract the new number by the original number
680 - 630 = 50
50 ÷ 630 = 0.07936507936507936
0.07936507936507936 x 100 = 7.94%