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Grade 7 math

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The rectangular base of a box has a perimeter of 60cm. The base is twice as long as it is wide. Saskia plans to cover the top and bottom with coloured paper;which cost 5 cents per square centimetre. She lans to cover the other 4 faces with white paper; which costs 1.5 cents per square centimetre. How much money will Saskia spend to cover the box with paper?(assume there is no waste)

height is 40 cm .

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