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convenience store offers 16 ounce cups for $0.89, 24 ounce cups for $0.99, 32 ounce cups for $1.09,
and 44 ounce cups for $1.19. Explain.
7. Calculate price per pound and pounds per dollar for a 4.75 pound package of hamburger that costs
$21.80. Another package of hamburger yields .1877 pounds per dollar. Which is the better buy?
Explain.
8. A buyer gets a 25% discount sale price, followed by a 10% senior citizen discount. What single
percent discount would be equivalent to these successive discounts? Why is it not 35%?
H
ardest Problem
How hard
can
it be? Can you still use what you’ve learned?
Based on the Models, the Methodologies, and the Demonstrate Your Understanding (DYU) problems in
this activity, create the
hardest
problem you can. Start with the hardest DYU problem in this experience
and by contrasting and comparing it with the other DYU problems, play “What if” with the different
conditions and parameters in the various problems.
Can you still solve the problem? If so, solve it. If not, explain why not.
What are the conditions and parameters that make a problem where you calculate prices before and after
discounts and/or markups a difficult problem to solve?
T
roubleshooting
Find the error and correct it!
Silas is working part-time as a retail store clerk in a local menswear store. A customer brings a pair of
pants marked “40% off” to the register. He also hands Silas a coupon for 25% off any single purchase in
the store, on that day. Silas knows the coupon is real; it is part of a series of special promotions the store
is running this month. He smiles at the customer and rings up the purchase as a sale for a single item at
65% off.
M
aking it Matter
Solving problems in your life
●
Eliza’s family has budgeted $175 per week for groceries. List three techniques she might use to be able
to buy her groceries and stay within her budget.
●
Sam wants to know how much to mark up his product so that 15% of the product’s final price will be
profit for him. Help him decide on his markup.
L
earning to Learn Mathematics
Reflecting on and appreciating your learning
1. What did you learn about adding/subtracting percents?
2. What prior knowledge of the properties of the real numbers allow us to take the discounts in either
order?
3. What learning skills are needed to interpret word problems that involve percents?
4. How do you use common sense in validating the results of a percent computation?
8.1 Consumer Finance