-41.94% is the change from 310 to 180
Calculation steps:
[( 180 - 310 ) ÷ 310] x 100 = -41.94%
Formula
Percentage change = [(180 - 310) / 310] x 100
Subtract the new number by the original number
180 - 310 = -130
-130 ÷ 310 = -0.41935483870967744
-0.41935483870967744 x 100 = -41.94%