256.25% is the change from 128 to 456
Calculation steps:
[( 456 - 128 ) ÷ 128] x 100 = 256.25%
Formula
Percentage change = [(456 - 128) / 128] x 100
Subtract the new number by the original number
456 - 128 = 328
328 ÷ 128 = 2.5625
2.5625 x 100 = 256.25%