200% is the change from 128 to 384
Calculation steps:
[( 384 - 128 ) ÷ 128] x 100 = 200%
Formula
Percentage change = [(384 - 128) / 128] x 100
Subtract the new number by the original number
384 - 128 = 256
256 ÷ 128 = 2
2 x 100 = 200%
Example