Page 357 - qrps

© 2014 Pacific Crest 357
Model(s) Exemplars and representations
Model 1: Ivan’s School Supplies
Scenario:Ivan’s mom has to buy him school supplies for the start of school this fall. The
school sent home a short list of items that he will need: Crayons (at least 16 colors),
a 3-ring binder, ruler, a pack of pencils, a pen, a pencil box, a highlighter, a pack of
lined notebook paper, and scissors. Mom is going to shop at a local store where they
are offering a 25%-off sale on all school supplies, not including backpacks, which
Ivan also needs. Her state has a 5% sales tax on all purchases. Determine the best
buys and the total cost she will have to pay for Ivan’s school supplies and backpack.
Step Model
1. Determine the original
price
The original prices are as follows:
Crayons
quantity price
16 $1.39
24 $3.19
64 $4.49
96 $5.79
120 $6.99
Pencils
quantity price
8 $1.00*
12 $1.59
24 $5.00**
* on sale today only
** higher quality
Highlighter
quantity price
3 $2.50
5 $3.00
3-Ring Binder$2.50
Ruler $1.00
Pen $3.99
Pencil Box $2.99
Paper $1.99
Scissors $3.00
Backpack $25.99
2. Determine the best buy
for any items that come in
various sizes/prices
The largest box of crayons is the best buy, but Ivan really doesn’t
need 120 crayons, so Mom chose the box of 16 crayons for $1.39
The best buy for pencils is the 8-pack for $1.00
The best buy for highlighters is the larger one, but Mom thinks the
smaller pack is enough, so she selects the 3-pack for $2.50
3. Total the prices of all items Crayons $1.39
Pencils $1.00
Highlighters $2.50
3-Ring Binder $2.50
Ruler $1.00
Pen $3.99
Pencil Box $2.99
Paper $1.99
Scissors $3.00
Total $20.36
Backpack
(not on sale) $25.99
8.1 Consumer Finance