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Ollivander sells sheets of aluminum in a variety of thicknesses: 1.0 mm at 0.55 $/cm2, 2.0 mm at 0.70 $/cm2, and 3.0 mm at 0.85 $/cm2 and various thicknesses in between all following the same linear trend. Harry needs 10.0 cm2 of 2.2 mm thick aluminum. How much does this cost him? Express your answer in Dollars.

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  1. Today, 10:13
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    10cm2 = $331.81

    Explanation:

    Giving the following information:

    2.0 mm at 0.70 $/cm2

    3.0 mm at 0.85 $/cm2

    0.1mm = 0.15/10 = $0.015

    We need 2.2mm thick:

    2.2mm = 0.70 + 0.015*2 = $0.73

    AND 10cm2:

    1cm = 10mm

    10cm = 100mm

    10cm2 = 1000mm

    1000mm/2.2 = 454.54*0.73 = $331.81

    10cm2 = $331.81
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