Using Percent. Warm-up: Get a calculator Find the percent of each number. 1)25% of 200 2)22% of 40 3)63% of 89 4)112% of 24 5)Jenny sold 380 boxes of.

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Lesson Objectives By the end of this lesson you will be able… Solve percent problems that involve discounts, tips, and sales, tax.

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Presentation transcript:

Using Percent

Warm-up: Get a calculator Find the percent of each number. 1)25% of 200 2)22% of 40 3)63% of 89 4)112% of 24 5)Jenny sold 380 boxes of cookies for her Girl Scout troop. 55% of the cookies sold were oatmeal cinnamon boxes. How many boxes of oatmeal cinnamon cookies did she sell?

Objectives As a learner, I will… –Solve percent problems that involve discount, tips and sales tax. *** Application Notes #12***

Common Uses of Percents DiscountsAn amount that is subtracted from the regular price of an item Discount = price * discount rate Total cost = price – discount TipsAn amount added to a bill for service Tip = bill * tip rate Total cost = bill + tip Sales taxAn amount added to the price of an item Sales tax = price * sales tax rate Total cost = price + sales tax

Helpful Hints You can find 10% of a number by moving the decimal point one place to the left You can find 1% of a number by moving the decimal point two places to the left You can find 5% of a number by finding half of 10% of the number

Finding Discounts Step 1: Calculate the discount Discount = price * discount rate Step 2: Subtract the discount from the regular price Total cost = price – discount

Finding Discounts Example 1: A music store sign reads “10% off the regular price.” If Nichole wants to buy a CD whose regular price is $15, about how much will she pay for her CD after the discount?

Finding Discounts You try… A clothing store is having a 25% off sale. If Angela wants to buy a sweater whose regular price is $20, how much will she pay for the sweater after the discount?

Finding Tips Step 1: Calculate the Tip Tip = bill * tip rate Step 2: Add the tip to the bill price Total cost = bill + tip

Finding Tips Example 2: Leslie’s lunch bill is $ She wants to leave a tip that is 15% of the bill. How much should her tip be? What will be the total amount of money she will pay?

Finding Tips You try… Ben’s dinner bill is $8.00. He wants to leave a tip that is 20% of the bill. How much should his tip be? What will be the total amount of money he will pay?

Finding Sales Tax Step 1: Calculate the Sales Tax Sales tax = price * sales tax rate Step 2: Add the sales tax to the price Total cost = price + sales tax

Finding Sales Tax Example 3: Marc is buying a scooter for $ The sales tax rate is 6%. How much will the sales tax be? How much will the total cost of the scooter be?

Finding Sales Tax You try… Ann is buying a $30 pair of jeans. The sales tax rate is 7%. How much will the total cost be?