Which Chinese Food Coupon Should I Use?

 
You are planning on having Chinese food including some Chicken Lo Mein delivered to your home.  You know you will spend at least $25.
 

• Which coupon should you use to save the most money?
• If you were planning on buying the Orange Chicken (but not any Chicken Lo Mein) and spend at least $50, which coupon should you use?

 

These questions may be useful in helping students down the problem solving path:

• What coupon do you think will save the most money?
• What information would be useful in figuring this out?
• What assumptions are we making?

 

The menu shows that Chicken Lo Mein costs $5.25.  So assuming you spend at least $25, that coupon will save you $5.25.  The only other coupon that is worth considering is the 10% off coupon.  That will only be wise to use if you spend more than $52.50 as you will then save more than $5.25.
 

• Menu with coupons

 
Mr. Taylor has modified this task to make it relevant to students in the United Kingdom. You may want to use his coupons instead.
 
Below are 2 low, medium, and high work samples.  The low work samples do not provide sufficient reasoning to make a coherent argument.  The medium work samples are notably better, but have gaps such as not addressing prices less than $25 on one of them or incorrectly determining the price range.  The high work samples are good but not perfect.  They provide a more comprehensive approach but also have small gaps.

• Low

• Low

• Medium

• Medium

• High

• High

 

• CCSS 7.RP.3 – Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.

 

• Restaurant menu