34.78% is the change from 115 to 155
Calculation steps:
[( 155 - 115 ) ÷ 115] x 100 = 34.78%
Formula
Percentage change = [(155 - 115) / 115] x 100
Subtract the new number by the original number
155 - 115 = 40
40 ÷ 115 = 0.34782608695652173
0.34782608695652173 x 100 = 34.78%