-9.09% is the change from 341 to 310
Calculation steps:
[( 310 - 341 ) ÷ 341] x 100 = -9.09%
Formula
Percentage change = [(310 - 341) / 341] x 100
Subtract the new number by the original number
310 - 341 = -31
-31 ÷ 341 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%