69.14% is the change from 512 to 866
Calculation steps:
[( 866 - 512 ) ÷ 512] x 100 = 69.14%
Formula
Percentage change = [(866 - 512) / 512] x 100
Subtract the new number by the original number
866 - 512 = 354
354 ÷ 512 = 0.69140625
0.69140625 x 100 = 69.14%