Home > MC1 > Chapter 9 > Lesson 9.3.3 > Problem9-150

9-150.

Unit price is defined as the cost of one unit of an item. Suppose a 16-ounce bottle of shampoo costs $3.68$. One way to find the unit price (that is, the price of one ounce of shampoo) is to write a proportion such as the one shown below.

$\frac { \ 3.68 } { 16 oz } = \frac { \ x } { 1 oz }$

Solving the proportion gives $x = 0.23$, so this shampoo costs $0.23$ per ounce.

1. Find the unit price of Italy olive oil, which costs $2.90$ for $10$ ounces.

$\frac{2.90}{10}=\frac{x}{1}$

$10x = 2.90$

$x = 0.29$

2. Find the unit price of Delicious olive oil, which costs $4.96$ for $16$ ounces.

Follow the steps in part (a) and in the example above.

3. If both brands are the same quality, which one is the better buy?

Italy is a better buy.