-12.31% is the change from 390 to 342
Calculation steps:
[( 342 - 390 ) ÷ 390] x 100 = -12.31%
Formula
Percentage change = [(342 - 390) / 390] x 100
Subtract the new number by the original number
342 - 390 = -48
-48 ÷ 390 = -0.12307692307692308
-0.12307692307692308 x 100 = -12.31%