20.39% is the change from 515 to 620
Calculation steps:
[( 620 - 515 ) ÷ 515] x 100 = 20.39%
Formula
Percentage change = [(620 - 515) / 515] x 100
Subtract the new number by the original number
620 - 515 = 105
105 ÷ 515 = 0.20388349514563106
0.20388349514563106 x 100 = 20.39%