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

To find the postage in cents per ounce, we need to convert the weight to ounces and then divide the cost of postage by the weight in ounces.

First, let's convert the weight of the box from pounds and ounces to ounces. Since there are 16 ounces in a pound, we multiply 2 pounds by 16 ounces to get 32 ounces. Then, we add 8 ounces to get a total weight of 40 ounces.

Now, we can calculate the postage in cents per ounce. We divide the cost of postage, $15.60, by the weight in ounces, which is 40.

$15.60 / 40 ounces = $0.39 per ounce

To convert this to cents per ounce, we multiply the dollar amount by 100 since there are 100 cents in a dollar.

$0.39 * 100 = 39 cents per ounce

Therefore, the postage cost was 39 cents per ounce.