-30.15% is the change from 388 to 271
Calculation steps:
[( 271 - 388 ) ÷ 388] x 100 = -30.15%
Formula
Percentage change = [(271 - 388) / 388] x 100
Subtract the new number by the original number
271 - 388 = -117
-117 ÷ 388 = -0.3015463917525773
-0.3015463917525773 x 100 = -30.15%