100.78% is the change from 256 to 514
Calculation steps:
[( 514 - 256 ) ÷ 256] x 100 = 100.78%
Formula
Percentage change = [(514 - 256) / 256] x 100
Subtract the new number by the original number
514 - 256 = 258
258 ÷ 256 = 1.0078125
1.0078125 x 100 = 100.78%