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Question

A tank with length, breadth and height of 8, 6 and 4 units respectively is open at the top. Find the cost of painting inside the tank at the rate of  ₹10 per sq.units.
  1. 1500
  2. 1600
  3. 1400
  4. 1450


Solution

The correct option is B 1600

Area inside the tank = Lateral Surface Area + floor area

=2h(l+b)+lb

 =2×4(8+6)+8×6

 =160 sq.units

Cost of painting 1 sq. unit = ₹10
So, total cost of painting
=10×Area inside the tank
=10×160
=1600

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