Question

Gary mailed a box that weighed 2 pounds 8 ounces. The postage cost $15.60. How much was the postage in cents per ounce?
weight = 2*16 + 8 = 40 oz
cost = 1560 cents

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