50% is the change from 512 to 768
Calculation steps:
[( 768 - 512 ) ÷ 512] x 100 = 50%
Formula
Percentage change = [(768 - 512) / 512] x 100
Subtract the new number by the original number
768 - 512 = 256
256 ÷ 512 = 0.5
0.5 x 100 = 50%
Example