3100% is the change from 4 to 128
Calculation steps:
[( 128 - 4 ) ÷ 4] x 100 = 3100%
Formula
Percentage change = [(128 - 4) / 4] x 100
Subtract the new number by the original number
128 - 4 = 124
124 ÷ 4 = 31
31 x 100 = 3100%
Example