Question

which is the better buy?
7 - kilogram bag of red onions for $19.20
9 - kilogram bag of red onions for $25.02

Explanation:

Step1: Calculate unit price for 7kg bag

To find the unit price (price per kilogram) for the 7 - kilogram bag, we use the formula \(\text{Unit Price}=\frac{\text{Total Price}}{\text{Weight}}\). For the 7 - kilogram bag with a total price of \(\$19.20\), the unit price is \(\frac{19.20}{7}\approx\$2.74\) (rounded to two decimal places).

Step2: Calculate unit price for 9kg bag

For the 9 - kilogram bag with a total price of \(\$25.02\), using the same unit price formula, the unit price is \(\frac{25.02}{9}=\$2.78\).

Step3: Compare unit prices

We compare the two unit prices. Since \(\$2.74<\$2.78\), the 7 - kilogram bag has a lower unit price.

Answer:

The 7 - kilogram bag of red onions for \(\$19.20\) is the better buy.