-27.1% is the change from 310 to 226
Calculation steps:
[( 226 - 310 ) ÷ 310] x 100 = -27.1%
Formula
Percentage change = [(226 - 310) / 310] x 100
Subtract the new number by the original number
226 - 310 = -84
-84 ÷ 310 = -0.2709677419354839
-0.2709677419354839 x 100 = -27.1%