-9.41% is the change from 340 to 308
Calculation steps:
[( 308 - 340 ) ÷ 340] x 100 = -9.41%
Formula
Percentage change = [(308 - 340) / 340] x 100
Subtract the new number by the original number
308 - 340 = -32
-32 ÷ 340 = -0.09411764705882353
-0.09411764705882353 x 100 = -9.41%