2.59% is the change from 502 to 515
Calculation steps:
[( 515 - 502 ) ÷ 502] x 100 = 2.59%
Formula
Percentage change = [(515 - 502) / 502] x 100
Subtract the new number by the original number
515 - 502 = 13
13 ÷ 502 = 0.025896414342629483
0.025896414342629483 x 100 = 2.59%