-7.74% is the change from 310 to 286
Calculation steps:
[( 286 - 310 ) ÷ 310] x 100 = -7.74%
Formula
Percentage change = [(286 - 310) / 310] x 100
Subtract the new number by the original number
286 - 310 = -24
-24 ÷ 310 = -0.07741935483870968
-0.07741935483870968 x 100 = -7.74%