✨ 最佳解答 ✨
設進貨x個
(1) 0≤x≤5 (全賣完)
利潤期望值= -8x+20x = 12x ≤ 12×5 = 60
(2) x=6 (賣5 or 6個)
利潤期望值= -8x+20(0.1×5+0.9×6) = -8x+118 = 70
(3) x=7 (賣5 or 6 or 7個)
利潤期望值= -8x+20(0.1×5+0.25×6+0.65×7)
= -8x+131 = 75
(4) x=8 (賣5 or 6 or 7 or 8個)
利潤期望值= -8x+20(0.1×5+0.25×6+0.35×7+0.3×8)
= -8x+137 = 73
(5) x≥9 (賣5 or 6 or 7 or 8 or 9個)
利潤期望值= -8x+20(0.1×5+0.25×6+0.35×7+0.2×8+0.1×9)
= -8x+139 ≤ -72+139 =67