1119.05% is the change from 21 to 256
Calculation steps:
[( 256 - 21 ) ÷ 21] x 100 = 1119.05%
Formula
Percentage change = [(256 - 21) / 21] x 100
Subtract the new number by the original number
256 - 21 = 235
235 ÷ 21 = 11.19047619047619
11.19047619047619 x 100 = 1119.05%