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math .please help its worth alot of my grade :s

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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 .

  • math .please help its worth alot of my grade :s - ,

    How far have you gotten in trying to solve this problem?

  • math .please help its worth alot of my grade :s - ,

    i honoustly havent gotten anything done because i don't understand this at all Ms.Sue

  • math .please help its worth alot of my grade :s - ,

    Let the width be x
    Then the length is 2x

    so, 2(x+2x) = 60
    6x = 60
    x = 10
    so, the box is 10x20

    The area of the top is 10*20 = 200, as is the bottom.

    There are two sides 10x40 = 2*400 = 800
    and 2*20*40 = 1600

    top and bottom cost 400*.05 = $20
    faces cost .015*2400 = $36

    Total cost: $56

  • math .please help its worth alot of my grade :s - ,

    thank you so much steve

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