12.11% is the change from 256 to 287
Calculation steps:
[( 287 - 256 ) ÷ 256] x 100 = 12.11%
Formula
Percentage change = [(287 - 256) / 256] x 100
Subtract the new number by the original number
287 - 256 = 31
31 ÷ 256 = 0.12109375
0.12109375 x 100 = 12.11%