120% is the change from 155 to 341
Calculation steps:
[( 341 - 155 ) ÷ 155] x 100 = 120%
Formula
Percentage change = [(341 - 155) / 155] x 100
Subtract the new number by the original number
341 - 155 = 186
186 ÷ 155 = 1.2
1.2 x 100 = 120%
Example