A square park having a side 20 m has two roads each 2 m wide running in the middle of it and parallel to its length and breath. What will be cost of gravelling the path at the rate of Rs. 100/m2?

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RRB ALP Previous Paper 13 (Held On: 20 Aug 2018 Shift 2)
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  1. Rs. 7,200
  2. Rs. 7,600
  3. Rs. 8,800
  4. Rs. 8,400

Answer (Detailed Solution Below)

Option 2 : Rs. 7,600
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Detailed Solution

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Given:

Side of park = 20 m

Width of the road = 2 m

Rate of traveling the path = 100/m2

Figure:

20 aug 2nd Shift deepak  3

Calculation:

Area of the road = area of rectangular path along length of square and breadth of square - common square area

⇒ 2 × (20 × 2) - 2 × 2 = 80 - 4 = 76 m2

∴ Cost of gravelling the path = 76 × 100 = Rs. 7,600

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