percent is a ratio out of 100 (per 100)

Percentis a ratio out of 100

(per 100)

.

Objective:We will solve problems involving

percent.

NS 1.4: Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips.

Prior Knowledge

What can you tell me about the word “Percent” or percent problems?

Think of vocabulary, rules, strategies and information you know!

RS CD

Vocabulary Example:• A pair of jeans that regularly cost $25.50 are on sale

for 20% off. What is the amount of the discount?

PartWhole

• Sale Price• Discount• Retail Price• Tax Rate

___20___ = __X___ 100 25.50

When solving a problem with a percent greater than 100%, the part will be greater than the whole

4 CentersRed Robin: Total and tipSports Authority: Percent of changeCamaro: Total with interestCell Phone: Amount of discount

Group NormsListen to each other’s ideas.Respect everyone’s opinion by asking for

clarification.Politely agree or disagree.Investigate together and stay on task.Make sure everyone in your group can

explain your group’s thought process.

Comparison Frame

Problem _______ is similar to problem __________ because__________.

After receiving an outstanding report card, Lucy took her son to lunch to celebrate. Lucy ordered a Crispy Chicken Sandwich, a cup of soup and a soft drink. Her son ordered a BLTA Croissant, a side salad and a Freckled Lemonade. Lucy also left a 20% tip. How much did they spend on lunch?

(Round to the nearest penny.)

The original price of a 54 inch glass in-ground basketball system is $1,198. On sale, the same system costs $799. What is the percent taken off of the original price?

(Round to the nearest tenth of a percent.)

The advertised cost of a new Camaro is $48,000. After including the interest rate of 4.9%, what is the total cost of a new Camaro?

Find the sale price on the $99 phone with a two year contract and a 60% discount.

Find the sale price on the $149 phone with a two year contract and a 68% discount.

Ticket out the Door

Other than the problems we did today, in what other situations would you use percents?