284.38% is the change from 256 to 984
Calculation steps:
[( 984 - 256 ) ÷ 256] x 100 = 284.38%
Formula
Percentage change = [(984 - 256) / 256] x 100
Subtract the new number by the original number
984 - 256 = 728
728 ÷ 256 = 2.84375
2.84375 x 100 = 284.38%