-10.53% is the change from 342 to 306
Calculation steps:
[( 306 - 342 ) ÷ 342] x 100 = -10.53%
Formula
Percentage change = [(306 - 342) / 342] x 100
Subtract the new number by the original number
306 - 342 = -36
-36 ÷ 342 = -0.10526315789473684
-0.10526315789473684 x 100 = -10.53%