# Act 1:

*Is there really 20% more?*

I was buying groceries the other day and came across this. Not quite sure how that happened.

# Act 2:

*What information would be useful to figure this out?*

The bottle’s shape doesn’t exactly fit into standard formulas, but I think that makes this more interesting. Also, the students will need to figure out that “20% more” means that 48 fl oz is 20% more than whatever was in the original sized bottle. This is a good opportunity to develop conceptual understanding of percents.

# Act 3:

So, I didn’t actually buy the original bottle. However, I had an empty one at home for the test run.

# Sequel:

*How much money should the store charge for this bottle?*

If the store charges $2.99 for a 40 ounce bottle, how much of a discount should they offer for the faulty product in this lesson?

# Lesson Page:

What are your thoughts? How can this be improved?