-42.59% is the change from 270 to 155
Calculation steps:
[( 155 - 270 ) ÷ 270] x 100 = -42.59%
Formula
Percentage change = [(155 - 270) / 270] x 100
Subtract the new number by the original number
155 - 270 = -115
-115 ÷ 270 = -0.42592592592592593
-0.42592592592592593 x 100 = -42.59%