- Ratios and Unit Rates
- Home
- Writing Ratios Using Different Notations
- Writing Ratios for Real-World Situations
- Identifying Statements that Describe a Ratio
- Simplifying a Ratio of Whole Numbers: Problem Type 1
- Simplifying a Ratio of Decimals
- Finding a Unit Price
- Using Tables to Compare Ratios
- Computing Unit Prices to Find the Better Buy
- Word Problem on Unit Rates Associated with Ratios of Whole Numbers: Decimal Answers
- Solving a Word Problem on Proportions Using a Unit Rate
- Solving a One-Step Word Problem Using the Formula d = rt
- Function Tables with One-Step Rules
- Finding Missing Values in a Table of Equivalent Ratios
- Using a Table of Equivalent Ratios to Find a Missing Quantity in a Ratio
- Writing an Equation to Represent a Proportional Relationship

- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who

# 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.