30.1% is the change from 515 to 670
Calculation steps:
[( 670 - 515 ) ÷ 515] x 100 = 30.1%
Formula
Percentage change = [(670 - 515) / 515] x 100
Subtract the new number by the original number
670 - 515 = 155
155 ÷ 515 = 0.30097087378640774
0.30097087378640774 x 100 = 30.1%