66.02% is the change from 515 to 855
Calculation steps:
[( 855 - 515 ) ÷ 515] x 100 = 66.02%
Formula
Percentage change = [(855 - 515) / 515] x 100
Subtract the new number by the original number
855 - 515 = 340
340 ÷ 515 = 0.6601941747572816
0.6601941747572816 x 100 = 66.02%