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14 15 An open box is made of wood 3\( \mathrm { cm } \) thick. Its external length, breadth and height are \( 1.48 \mathrm { m } , 1.16 \mathrm { m } \) and 8.3\( \mathrm { dm } \) . Find the cost of painting the inner surface of \( \mathrm { Rs } 50 \) per sq. metre The cost of preparing the walls of a room 12\( \mathrm { m } \) long at the rate of Rs 1.35 per square

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