-18.81% is the change from 388 to 315
Calculation steps:
[( 315 - 388 ) ÷ 388] x 100 = -18.81%
Formula
Percentage change = [(315 - 388) / 388] x 100
Subtract the new number by the original number
315 - 388 = -73
-73 ÷ 388 = -0.18814432989690721
-0.18814432989690721 x 100 = -18.81%