250% is the change from 128 to 448
Calculation steps:
[( 448 - 128 ) ÷ 128] x 100 = 250%
Formula
Percentage change = [(448 - 128) / 128] x 100
Subtract the new number by the original number
448 - 128 = 320
320 ÷ 128 = 2.5
2.5 x 100 = 250%
Example