66.8% is the change from 518 to 864
Calculation steps:
[( 864 - 518 ) ÷ 518] x 100 = 66.8%
Formula
Percentage change = [(864 - 518) / 518] x 100
Subtract the new number by the original number
864 - 518 = 346
346 ÷ 518 = 0.667953667953668
0.667953667953668 x 100 = 66.8%