66.86% is the change from 510 to 851
Calculation steps:
[( 851 - 510 ) ÷ 510] x 100 = 66.86%
Formula
Percentage change = [(851 - 510) / 510] x 100
Subtract the new number by the original number
851 - 510 = 341
341 ÷ 510 = 0.6686274509803921
0.6686274509803921 x 100 = 66.86%