62.3% is the change from 512 to 831
Calculation steps:
[( 831 - 512 ) ÷ 512] x 100 = 62.3%
Formula
Percentage change = [(831 - 512) / 512] x 100
Subtract the new number by the original number
831 - 512 = 319
319 ÷ 512 = 0.623046875
0.623046875 x 100 = 62.3%