-27.74% is the change from 310 to 224
Calculation steps:
[( 224 - 310 ) ÷ 310] x 100 = -27.74%
Formula
Percentage change = [(224 - 310) / 310] x 100
Subtract the new number by the original number
224 - 310 = -86
-86 ÷ 310 = -0.27741935483870966
-0.27741935483870966 x 100 = -27.74%