67.65% is the change from 510 to 855
Calculation steps:
[( 855 - 510 ) ÷ 510] x 100 = 67.65%
Formula
Percentage change = [(855 - 510) / 510] x 100
Subtract the new number by the original number
855 - 510 = 345
345 ÷ 510 = 0.6764705882352942
0.6764705882352942 x 100 = 67.65%