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The Situation
You are planning on having Chinese food including some Chicken Lo Mein delivered to your home.  You know you will spend at least $25.
 
The Challenge(s)
  • 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?

 

Question(s) To Ask
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?

 

Consider This
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.
 
What You'll Need
  • Menu with coupons

 
Teacher Work
Mr. Taylor has modified this task to make it relevant to students in the United Kingdom. You may want to use his coupons instead.
 
Student Work
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

 
Content Standard(s)
  • 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.

 

Source(s)
  • Restaurant menu

 

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