# Computing Unit Prices to Find the Better Buy

We are asked sometimes to determine which of any two given items is a "better buy". We find the unit price of each item, then comparing the unit prices, we decide that the item with the smaller unit price is the "better buy".

At a book exhibition, vendor A was selling a 4 books set for $39.20. Vendor B was selling a 6 books set for$52.98. Books from which vendor were the better buy?

### Solution

Step 1:

Unit price of vendor A books = $$\frac{39.20}{4} =$$9.80$Unit price of vendor B books = $$\frac{52.98}{6} =$$8.83$

Step 2:

As $9.80 >$8.83, books from the vendor B were the better buy.

A store had 7 white chairs for $142.94 or 5 black chairs for$101.90.

Which color chair has a lower unit price?

### Solution

Step 1:

Unit price of white chairs = $$\frac{142.94}{7} =$$20.42$Unit price of black chairs = $$\frac{101.90}{5} =$$20.38$

Step 2:

As $20.38 <$20.42, black chairs have a lower unit price.