28% is the change from 100 to 128
Calculation steps:
[( 128 - 100 ) ÷ 100] x 100 = 28%
Formula
Percentage change = [(128 - 100) / 100] x 100
Subtract the new number by the original number
128 - 100 = 28
28 ÷ 100 = 0.28
0.28 x 100 = 28%
Example