Property Dealer Rectangular Land Plot

XAT 2012 · Quantitative Ability & Data Interpretation · Hard · Geometry

A property dealer bought a rectangular piece of land at 1000/sq. ft. The length of the plot is less than twice its breadth. Due to its size, there were no buyers for the full plot. Hence he decided to sell it in smaller sized pieces as given below. The largest square from one end was sold at 1200/sq. ft. From the remaining rectangle the largest square was sold at 1150/sq. ft. Due to crash in the property prices, the dealer found it difficult to make profit from the sale of the remaining part of the land. If the ratio of the perimeter of the remaining land to the perimeter of the original land is 3 : 8, at what price (in rupees) the remaining part of the land is to be sold such that the dealer makes an overall profit of 10%?

  1. A.

    500/sq. ft.

  2. B.

    550/sq. ft.

  3. C.

    600/sq. ft.

  4. D.

    650/sq. ft.

  5. E.

    None of the above.

Answer

B

Explanation

Let original dimensions be length ll and breadth bb, with b<l<2bb < l < 2b.

  1. Cut largest square b×bb \times b, area b2b^2, leaving rectangle (l−b)×b(l-b) \times b.
  2. Cut largest square from remaining: side (l−b)(l-b), area (l−b)2(l-b)^2.
  3. Remaining rectangle GHCF has length l−bl-b and breadth b−(l−b)=2b−lb - (l-b) = 2b - l. Perimeter GHCF = 2[(l−b)+(2b−l)]=2b2[(l-b) + (2b-l)] = 2b. Perimeter original = 2(l+b)2(l+b). Given 2b2(l+b)=38  ⟹  8b=3l+3b  ⟹  5b=3l  ⟹  l=5,b=3\frac{2b}{2(l+b)} = \frac{3}{8} \implies 8b = 3l + 3b \implies 5b = 3l \implies l = 5, b = 3. Total area = 1515 sq ft. Total cost @ 1000 = 15,000. Target SP (10% profit) = 16,500. First square SP (32×12003^2 \times 1200) = 9×1200=10,8009 \times 1200 = 10,800. Second square SP (22×11502^2 \times 1150) = 4×1150=4,6004 \times 1150 = 4,600. Remaining area = 15−9−4=215 - 9 - 4 = 2 sq ft. Let selling price per sq ft be xx. 10,800+4,600+2x=16,500  ⟹  15,400+2x=16,500  ⟹  2x=1100  ⟹  x=55010,800 + 4,600 + 2x = 16,500 \implies 15,400 + 2x = 16,500 \implies 2x = 1100 \implies x = 550/sq. ft.

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