-34.38% is the change from 480 to 315
Calculation steps:
[( 315 - 480 ) ÷ 480] x 100 = -34.38%
Formula
Percentage change = [(315 - 480) / 480] x 100
Subtract the new number by the original number
315 - 480 = -165
-165 ÷ 480 = -0.34375
-0.34375 x 100 = -34.38%