-28.75% is the change from 480 to 342
Calculation steps:
[( 342 - 480 ) ÷ 480] x 100 = -28.75%
Formula
Percentage change = [(342 - 480) / 480] x 100
Subtract the new number by the original number
342 - 480 = -138
-138 ÷ 480 = -0.2875
-0.2875 x 100 = -28.75%