18.26% is the change from 115 to 136
Calculation steps:
[( 136 - 115 ) ÷ 115] x 100 = 18.26%
Formula
Percentage change = [(136 - 115) / 115] x 100
Subtract the new number by the original number
136 - 115 = 21
21 ÷ 115 = 0.1826086956521739
0.1826086956521739 x 100 = 18.26%