-54.41% is the change from 340 to 155
Calculation steps:
[( 155 - 340 ) ÷ 340] x 100 = -54.41%
Formula
Percentage change = [(155 - 340) / 340] x 100
Subtract the new number by the original number
155 - 340 = -185
-185 ÷ 340 = -0.5441176470588235
-0.5441176470588235 x 100 = -54.41%