51.46% is the change from 515 to 780
Calculation steps:
[( 780 - 515 ) ÷ 515] x 100 = 51.46%
Formula
Percentage change = [(780 - 515) / 515] x 100
Subtract the new number by the original number
780 - 515 = 265
265 ÷ 515 = 0.5145631067961165
0.5145631067961165 x 100 = 51.46%