814.29% is the change from 28 to 256
Calculation steps:
[( 256 - 28 ) ÷ 28] x 100 = 814.29%
Formula
Percentage change = [(256 - 28) / 28] x 100
Subtract the new number by the original number
256 - 28 = 228
228 ÷ 28 = 8.142857142857142
8.142857142857142 x 100 = 814.29%