29.71% is the change from 515 to 668
Calculation steps:
[( 668 - 515 ) ÷ 515] x 100 = 29.71%
Formula
Percentage change = [(668 - 515) / 515] x 100
Subtract the new number by the original number
668 - 515 = 153
153 ÷ 515 = 0.2970873786407767
0.2970873786407767 x 100 = 29.71%