This lesson teaches how to solve multi-step ratio and percent problems using proportions. It explains that the value a percent represents depends on the whole, using examples like a lunch bill with a coupon and tax, and purchasing with multiple coupons. The lesson emphasizes the importance of understanding how the whole changes in multi-step problems and concludes with a summary of key concepts.

What is the final amount paid for the art drawing pad after applying the two coupons?

Describe the process of applying a 50% discount followed by an additional 40% discount on an item.

How does the concept of 'whole' change throughout a multi-step problem?