Internet cost

Internet cost

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about comparing different prices for internet access.
Three companies offer different plans to access the Internet. Here are their monthly charges.

  • SHARP charge $1.50 per hour.
  • REAL charge a $10.00 fee for up to 15 hours use and $2.00 per hour after that.
  • WINS charge $2.00 per hour for the first 10 hours and $1.00 per hour after that.
 
a)
 
What would it cost you if you used 20 hours of access time one month and used the scheme offered by
 
i)     SHARP?   $___________
 
ii)    REAL?      $___________
 
iii)   WINS?      $___________

 
b)
 
This graph shows the cost of Internet use with the company REAL for different levels of monthly usage. On this graph draw the lines showing the Internet costs using the other two companies.
 
c)
Which company would be cheapest if your average monthly Internet use was
 
i)     10 hours? __________
 
ii)     less than 5 hours? __________
Task administration: 
This task is completed with pencil and paper only.
Level:
5
Curriculum info: 
Maths, Number and Algebra, Equations and expressions
Keywords: 
graph construction, graph interpretation, linear equations, breakeven points
Description of task: 
Students interpret and graph linear equations of monthly charges for Internet access.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Using symbols and expressions to think mathematically, sets 6-7
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 

   

Y10 (11/1999)

a)

i)
ii)
iii)

30
20
30

very easy
easy
very easy

b)

 

moderate
 
 

difficult

c)

 

REAL
SHARP

moderate