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An open box is made of wood 3 cm thick. Its external length, breadth and height are 1.48 m, 1.16 m and 8.3 m.

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An open box is made of wood 3 cm thick. Its external length, breadth and height are 1.48 m, 1.16 m and 8.3 m. Find the cost of painting the inner surface of Rs 50 per sq. metre.

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Given 

Length = 1.48 m = 148 cm 

Breath = 1.16 m = 116 cm 

Height = 8.3 m = 83 cm 

Thickness of wood = 3 cm

inner dimensions:

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