Add up all of the weights for your prepackaged items and then add up all of the costs for your four prepackaged items.
From the totals, find the average cost per ounce of prepackaged items. Convert your results to cost per pound; using proportions will help. [Hint: How many ounces in a pound?]
Now, compare the cost per pound of unprocessed food compared to prepackaged processed food. Amazed?
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To find the average cost per ounce of prepackaged items, you need to sum up the costs and weights of the four prepackaged items. Let's assume you have the following information:
Item 1: Weight = W1 ounces, Cost = C1 dollars
Item 2: Weight = W2 ounces, Cost = C2 dollars
Item 3: Weight = W3 ounces, Cost = C3 dollars
Item 4: Weight = W4 ounces, Cost = C4 dollars
To find the total weight of prepackaged items, you add the weights of all four items:
Total Weight = W1 + W2 + W3 + W4 ounces
Next, find the total cost of the prepackaged items by adding the costs:
Total Cost = C1 + C2 + C3 + C4 dollars
To find the average cost per ounce, divide the total cost by the total weight:
Average Cost per Ounce = Total Cost / Total Weight dollars/ounce
To convert the cost to cost per pound, you need to know that there are 16 ounces in a pound. Multiply the cost per ounce by the number of ounces in a pound:
Cost per Pound = Average Cost per Ounce x 16 dollars/pound
Now that you have the cost per pound for prepackaged items, you can compare it to the cost per pound of unprocessed food. Gather the cost per pound of unprocessed food, and then compare the two values.
If the cost per pound of prepackaged processed food is higher than the cost per pound of unprocessed food, you may be amazed at the price difference.