-8.28% is the change from 338 to 310
Calculation steps:
[( 310 - 338 ) ÷ 338] x 100 = -8.28%
Formula
Percentage change = [(310 - 338) / 338] x 100
Subtract the new number by the original number
310 - 338 = -28
-28 ÷ 338 = -0.08284023668639054
-0.08284023668639054 x 100 = -8.28%