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BÀI : a) Phương trình ngân sách có dạng : X*Px+Y*Py=I 40000X+20000Y=2000000 I/Py = 100 I/Px = 50 Y 100 50 X b) MUx = 2Y MUy = 2X Để tối đa hố lợi ích cần thỗ mãn : XPx + YPy = I (1) MUx/Px = MUy/Py (2) (1) : 40000X + 20000Y = 2000000 (2) : 2Y/40000 = 2X/20000 2X-Y=0 Từ (1)và (2) ta hệ pt 40000X+20000Y=2000000 2X-Y=0 X = 25 Y = 50