-49.51% is the change from 307 to 155
Calculation steps:
[( 155 - 307 ) ÷ 307] x 100 = -49.51%
Formula
Percentage change = [(155 - 307) / 307] x 100
Subtract the new number by the original number
155 - 307 = -152
-152 ÷ 307 = -0.495114006514658
-0.495114006514658 x 100 = -49.51%