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a) A rectangular advertisement board will be set up beside the main road of a crowded traffic junction. The printed material on the advertisement board

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a) A rectangular advertisement board will be set up beside the main road of a crowded traffic junction. The printed material on the advertisement board will occupy 50 m of the area. In order to allow sufficient support to erect the advertisement board, it is suggested to have the margins of 0.5 m at the top and bottom and I m at each side. Please estimate the most economical overall area of the advertisement board which meets the specifications. [Differentiation quotient rule:()' = fagot'e'] 1 (15 marks) g2

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