-39.35% is the change from 310 to 188
Calculation steps:
[( 188 - 310 ) ÷ 310] x 100 = -39.35%
Formula
Percentage change = [(188 - 310) / 310] x 100
Subtract the new number by the original number
188 - 310 = -122
-122 ÷ 310 = -0.3935483870967742
-0.3935483870967742 x 100 = -39.35%