199.22% is the change from 256 to 766
Calculation steps:
[( 766 - 256 ) ÷ 256] x 100 = 199.22%
Formula
Percentage change = [(766 - 256) / 256] x 100
Subtract the new number by the original number
766 - 256 = 510
510 ÷ 256 = 1.9921875
1.9921875 x 100 = 199.22%