-6.43% is the change from 342 to 320
Calculation steps:
[( 320 - 342 ) ÷ 342] x 100 = -6.43%
Formula
Percentage change = [(320 - 342) / 342] x 100
Subtract the new number by the original number
320 - 342 = -22
-22 ÷ 342 = -0.06432748538011696
-0.06432748538011696 x 100 = -6.43%