bell work explain why jamars solution was incorrect

Bell Work

• Explain why Jamar’s solution was incorrect.

6-2B Percent 6-2B Percent ProportionProportion

Review on Solving Proportions

1.

2.1008.412

x

10052 x

Hint: Use Cross Products and solve for x!

Percent Proportions

• Since we know we can represent a percent as a fraction over 100, we can set up proportions to find missing values!

100percent

wholepart

Types of Percent Problems

Percent Proportion Steps:

1.Write out proportion2. Find Cross Products3. Solve

Practice- You TryRally Coach

1.What percent of 50 is 18?2.What number is 2% of 35?3.What percent of $90 is $9?4.What number is 25% of 180?

6-2C Percent 6-2C Percent EquationEquation

Percent Equation

Find the Part

Find the Percent

Find the Whole

Three Types of Percent Problems

Practice- You TryRally Coach

1.What is 6% of 19?2. 27 is what percent of 150?3.What percent of 40 is 9?4. 24 is 32% of what number?5.14% of what number is 7?

Sales tax and Sales tax and tip! tip!

Adding that little extra!

Vocabulary• Sales tax

Sales

Sales TaxMethod 1:1) Calculate the tax of the total (% as decimal x total price)2) Add tax to total3) Check that it makes sense!

Method 2:1) Calculate the final price including the tax (total x 1+% as decimal, ex: 7% tax x by 1.07)2) Check that it makes sense!

Discuss with your shoulder partner two different

methods for calculating sales tax!

You try- Choose Your Method!

What is the total cost of a sweatshirt if the regular price is $42 and the sales tax is 5 ½ %?

Vocabulary• Sales tax

• Tip or Gratuity

Tip or GratuityMethod 1:1) Calculate the tip of the total (% as decimal x total price)2) Add tax to total3) Check that it makes sense!

Method 2:1) Calculate the final price including the tip (total x 1+% as decimal, ex: 20% tip x by 1.2)2) Check that it makes sense!

You try- Choose Your Method

Scott wants to tip his taxicab driver. If his commute costs $15 and he wants to give the driver a 20% tip, what is the total cost?

Wrap up!• Explain to your shoulder partner

the two different ways to calculate tax and tip!

• Explain why one method might be easier than the other.

DiscountDiscountSaving some money!

Vocabulary• Sales tax

• Tip or Gratuity

•Discount

Discounts• Similar to Tip and Discount, but you subtract!

Method 1: 1)Find the percent of the total (this is discount amount)2)SUBTRACT the discount from the total3)Check that it makes sense!

Method 2:1)Find the percent you will actually be paying by

subtracting the given percent from 100% (example: 30 % off 100-30 = 70% you will pay)

2)Multiply the percent you will pay in decimal form by the total

3)Check that it makes sense!

You try- Choose Your Method

1)A shirt is regularly priced at $42. It is on sale for 15% off. What is the sale price of the shirt?

2)What is the total WITH 7% tax?

Wrap up!• Describe two methods for finding the

sale price of an item that is discounted 30%.

• Which method do you prefer? Explain.