51.56% is the change from 512 to 776
Calculation steps:
[( 776 - 512 ) ÷ 512] x 100 = 51.56%
Formula
Percentage change = [(776 - 512) / 512] x 100
Subtract the new number by the original number
776 - 512 = 264
264 ÷ 512 = 0.515625
0.515625 x 100 = 51.56%