作者somewaylin

以老闆立場來說:
對外公布利潤:
(500-400) / 1000 = 100 / 1000 = 0.1 = 10%
對內公布利潤:
(500-400) / 500 = 100 / 500 = 0.2 = 20%
實際利潤:
(500-400) / 400 = 100 / 400 = 0.25 = 25%