-7.18% is the change from 418 to 388
Calculation steps:
[( 388 - 418 ) ÷ 418] x 100 = -7.18%
Formula
Percentage change = [(388 - 418) / 418] x 100
Subtract the new number by the original number
388 - 418 = -30
-30 ÷ 418 = -0.07177033492822966
-0.07177033492822966 x 100 = -7.18%