66.8% is the change from 512 to 854
Calculation steps:
[( 854 - 512 ) ÷ 512] x 100 = 66.8%
Formula
Percentage change = [(854 - 512) / 512] x 100
Subtract the new number by the original number
854 - 512 = 342
342 ÷ 512 = 0.66796875
0.66796875 x 100 = 66.8%