-49.35% is the change from 310 to 157
Calculation steps:
[( 157 - 310 ) ÷ 310] x 100 = -49.35%
Formula
Percentage change = [(157 - 310) / 310] x 100
Subtract the new number by the original number
157 - 310 = -153
-153 ÷ 310 = -0.4935483870967742
-0.4935483870967742 x 100 = -49.35%