-49.35% is the change from 306 to 155
Calculation steps:
[( 155 - 306 ) ÷ 306] x 100 = -49.35%
Formula
Percentage change = [(155 - 306) / 306] x 100
Subtract the new number by the original number
155 - 306 = -151
-151 ÷ 306 = -0.4934640522875817
-0.4934640522875817 x 100 = -49.35%