Gary mailed a box that weighed 2 pounds 8 ounces. The postage cost $15.60. How much was the postage in cents per ounce?

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  1. weight = 2*16 + 8 = 40 oz
    cost = 1560 cents

    cost / weight = 1560/40 = 39 cents/oz

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  2. 1 pound= 16 ounces

    2 pounds=2*16= 32 ounces

    2 pounds 8 ounces=32+8= 40 ounces

    15.6/40= 0.39 $/ounce

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