67.95% is the change from 518 to 870
Calculation steps:
[( 870 - 518 ) ÷ 518] x 100 = 67.95%
Formula
Percentage change = [(870 - 518) / 518] x 100
Subtract the new number by the original number
870 - 518 = 352
352 ÷ 518 = 0.6795366795366795
0.6795366795366795 x 100 = 67.95%