week 13 discounts. do now (3 mins) pkb (prior knowledge box) topic: discountsmisconceptions complete...
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DO NOW (3 mins)PKB (Prior Knowledge Box)Topic: Discounts Misconceptions
Complete this side only. List anything that you know about the above topic.
You buy a pair of jeans at h&m that is 33% off the original price of $29. What is
the sale price?
Intro
VOCABULARY•Discount: A ________or amount of decrease in the price of an item.
• Sale price = original price - ___________
• % OF A NUMBER % OF A NUMBER • % X THE NUMBER% X THE NUMBER
KEY INFORMATION
EXAMPLEEXAMPLE30% OF $6030% OF $60= 0.30(60)= 0.30(60)= $18= $18SALE = ORIGINAL-DISCOUNTSALE = ORIGINAL-DISCOUNT = $60-$18= $60-$18 = $42= $42
Example#1
The original price of a shirt is $18. The shirt is on sale for a 20% discount.
What is the sale price of the shirt?
SOLUTION
Discount = 20% of $18 Find the amount of discount.
= 0.20(18)
= 3.60
Sale price = original price - discount Use formula to find sale price.
= 18 - 3.60
= 14.40
ANSWER The sale price of the shirt is $14.40.
Prior Knowledge Box (PKB)Topic: Discounts Misconceptions
What did you think you knew but you found out was a misconception? If you didn’t have any prior knowledge, what did you learn/ review today?
So what does it look like on the CAHSEE?
20. A CD player regularly sells for $80. It is on sale for 20% off. What is the sale price of the CD player?
A $16B $60C $64D $96
19. A pair of jeans regularly sells for $24.00. They are on sale for 25% off.
What is the sale price of the jeans?
A $6.00B $18.00C $20.00D $30.00
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