-20.62% is the change from 388 to 308
Calculation steps:
[( 308 - 388 ) ÷ 388] x 100 = -20.62%
Formula
Percentage change = [(308 - 388) / 388] x 100
Subtract the new number by the original number
308 - 388 = -80
-80 ÷ 388 = -0.20618556701030927
-0.20618556701030927 x 100 = -20.62%