-28.06% is the change from 310 to 223
Calculation steps:
[( 223 - 310 ) ÷ 310] x 100 = -28.06%
Formula
Percentage change = [(223 - 310) / 310] x 100
Subtract the new number by the original number
223 - 310 = -87
-87 ÷ 310 = -0.2806451612903226
-0.2806451612903226 x 100 = -28.06%