240% is the change from 115 to 391
Calculation steps:
[( 391 - 115 ) ÷ 115] x 100 = 240%
Formula
Percentage change = [(391 - 115) / 115] x 100
Subtract the new number by the original number
391 - 115 = 276
276 ÷ 115 = 2.4
2.4 x 100 = 240%
Example