67.38% is the change from 512 to 857
Calculation steps:
[( 857 - 512 ) ÷ 512] x 100 = 67.38%
Formula
Percentage change = [(857 - 512) / 512] x 100
Subtract the new number by the original number
857 - 512 = 345
345 ÷ 512 = 0.673828125
0.673828125 x 100 = 67.38%