139% is the change from 341 to 815
Calculation steps:
[( 815 - 341 ) ÷ 341] x 100 = 139%
Formula
Percentage change = [(815 - 341) / 341] x 100
Subtract the new number by the original number
815 - 341 = 474
474 ÷ 341 = 1.3900293255131966
1.3900293255131966 x 100 = 139%