400% is the change from 31 to 155
Calculation steps:
[( 155 - 31 ) ÷ 31] x 100 = 400%
Formula
Percentage change = [(155 - 31) / 31] x 100
Subtract the new number by the original number
155 - 31 = 124
124 ÷ 31 = 4
4 x 100 = 400%
Example