156% is the change from 50 to 128
Calculation steps:
[( 128 - 50 ) ÷ 50] x 100 = 156%
Formula
Percentage change = [(128 - 50) / 50] x 100
Subtract the new number by the original number
128 - 50 = 78
78 ÷ 50 = 1.56
1.56 x 100 = 156%
Example