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If objective function Z=20x+30yZ = 20x + 30y of an LPP is subject to the constraints 3x+4y≥123x + 4y \geq 12, 4x+y≥44x + y \geq 4, x≥0,y≥0x \geq 0, y \geq 0, then Z has :

(A) Min at (0, 4)

(B) Max at (0, 4)

(C) Min at (4, 0)

(D) Max at (4, 0)

(E) Min at (413,3613)\left(\frac{4}{13}, \frac{36}{13}\right)

Choose the correct answer from the options given below :

Solution

✅ Correct Option: 1

Corner points: (0,4)(0,4), (4/13,36/13)(4/13, 36/13), (4,0)(4,0).

Z(0,4)=120Z(0,4)=120, Z(4/13,36/13)=1160/13≈89.2Z(4/13, 36/13)=1160/13\approx 89.2, Z(4,0)=80Z(4,0)=80.

Minimum =80=80 at (4,0)(4,0). Region unbounded so no maximum exists. Only (C) is correct.

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