-50.48% is the change from 313 to 155
Calculation steps:
[( 155 - 313 ) ÷ 313] x 100 = -50.48%
Formula
Percentage change = [(155 - 313) / 313] x 100
Subtract the new number by the original number
155 - 313 = -158
-158 ÷ 313 = -0.5047923322683706
-0.5047923322683706 x 100 = -50.48%