Sagot :
When we look at the price of a product that comes in a different size we will notice that said product has a price per unit of measure of the product.
For example, milk is usually measured in gallons or ounces. Let's say that Store A has two different presentations of milk. One costs $3.27 and the other $3.46. To compare unit prices we need to know the total amount on each of the presentations.
let's say the first one has 59 oz, therefore, the unit price is:
[tex]p_1=\frac{3.27}{59\text{ oz}}=0.055[/tex]Therefore, the unit price is 5.5 cents per ounce.
For the second product, we have a total of 128 ounces, therefore, the unit price is:
[tex]p_2=\frac{3.46}{128\text{ ounces}}=0.022[/tex]Therefore, the unit price is 2.2 cents per ounce.
Now, let's say that Store B has a product of milk that costs $4.67 and has a total content of 48 ounces. The unit price for this product is:
[tex]p_3=\frac{4.67}{48\text{ ounces}}=0.097[/tex]This means that the unit price is 9.7 cents per ounce.
Comparing the unit prices of the three products we notice that the best deal is the first product since it offers a less price per unit of the product.