Percent of Change, Discount, Tax, Tip

Percents: Tax, Tip, Discount

By Carrie Wiederholz

We can use our percent proportion to solve for: discounts, sales tax, markups, percent of change, tip...​

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​Modified Percent Proportion

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​Part (is): What part are we looking for or what part did they give us?

Whole (of): What was the whole amount that we started with or what is the whole amount that we are looking for?

p(%): what is the percent in the problem or what percent are we looking for?

Multiple Select

Which of the following represents the correct percent proportion?

• $$\frac{whole}{part\ }=\frac{\%}{100}$$

• $$\frac{part}{whole}=\ \frac{\%}{100}$$

Multiple Select

Last week I made a batch of cookies. The recipe makes 30 cookies. I ate 25% of them. How many cookies did I eat?

Select the correct way to set up this equation:

• $$\frac{30}{whole}=\frac{25}{100}$$

• $$\frac{part}{30}=\frac{25}{100}$$

​Vocabulary

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Original Price: the price of goods and services BEFORE any discount, sales tax or tip.

Discount: the amount that is SUBTRACTED from the original price of goods and services.

Sales Price: the price AFTER a discount has been applied to the original price.

​Vocabulary

​Sales Tax: a tax that is ADDED to the price of particular goods and services.
Commission: a percentage of sales that is often ADDED to an employees base salary. 

Tip: are quantities of money that are ADDED onto to the original cost of a bill

Multiple Select

Which term(s) involve adding back to the original amount? Select all that apply

• sales tax

• discount

• tip

• commission

Multiple Choice

Sales tax is __________ to the price

• subtracted

• added

• multiplied

• divided

SALES TAX

• An extra fee we pay on the items we buy at the store (ADDED TO PRICE)

• Sales Tax is a percent that changes based on the state you live in

• Texas = 6.25%

• Oklahoma = 4.5%

Multiple Choice

Find the sales tax only. $199.95 iphone; 7% tax

• $ 13.98

• $ 213.95

• $14.00

• $15.90

What is the total price?

• Sales tax is always ADDED to the cost of the item!

• 199.95 + 14.00 = 213.95

• $213.95 for the iPhone including tax!

Multiple Choice

Find the sales tax only. $34 groceries; 8% tax

• $ 2.72

• $ 36.89

• $ 3.00

• $ 28.90

What is the total price?

• Sales tax is always ADDED to the cost of the item!

• 34.00 + 2.72 = 36.72

• $36.72 for the groceries including tax!

Multiple Choice

Lona wants to a buy raincoat for her goat.  If the raincoat costs $39.99 and has a sales tax rate of 7%.  What will be the FINAL PRICE (with tax) of the raincoat?  

• $42.79
• $42.78
• $2.80
• $2.79

TIPS!

- Additional money paid to workers from customers

- Usually given for great service!

- Type ONE job where they receive tips in the chat

Multiple Choice

Eliza bought a meal that cost $12.00. She tipped the waiter 25% of that amount. How much was the tip?

• $ 15.00
• $ 12.25
• $3.00
• $4.00

What is the total price?

• The tip is always ADDED to the cost!

• 12.00 + 3.00 = 15.00

• $15.00 for Eliza's meal including tip.

Multiple Choice

How much would the tip be if you left 18% on a $75.45 steak dinner?

• $ 13.58
• $ 89.03
• $ 61.87
• $135.80

What is the total price?

• The tip is always ADDED to the cost!

• 75.45 + 13.58

• $88.93 for the steak dinner including tip.

Multiple Choice

Angela spent $30.00 at a restaurant.  If she leaves a 15% tip, how much will her TOTAL BILL be? 

• 30.00
• 45.25
• $ 34.50
• 35.65

Multiple Choice

Daniel has dinner at a restaurant and the cost of his meal is $28.00. Because of the service, he wants to leave a 20% tip. What is his total bill including tip?

• 33.60
• 40.00
• 24.60
• 30.50

What is a discount?

an amount or percentage subtracted from the normal selling price of something

Multiple Choice

Discounts are always ______________ from the original price

• ADDED

• SUBTRACTED

• MULTIPLIED

• DIVIDED

Multiple Choice

A discounted price means the price has

• decreased
• increased

Multiple Choice

When you have a discount, do you add or subtract the discount from the total?

• Subtract
• Add

Practice Calculating Discount

• Airpods cost $169.00

• Walmart is selling them for 15% off!

• How much money would you save going to Walmart?

• 15% of 169.00

• $25.35

Multiple Choice

Gabby has a coupon for 20% off of her meal at Outback. What is the amount of the discount Gabby receives if her meal cost $28?

• $22.40

• $4.20

• $5.60

• 33.60

Multiple Choice

A pair of shoes cost $50.00. A 20% discount is offered. What is the amount of discount?

• $5.00

• $10.00

• $60.00

• $40.00

Practice Calculating Total Cost

• Step 1: Find the percent of

• 10% of $21

• $2.10 = amount of discount

• Step 2: Subtract

• $21 - $2.10 = $18.90

Multiple Choice

Kimoni wants to purchase a pair of shoes that are on sale for 10% off the regular price of $64.00. Which is the sale price of the shoes?

• $6.40

• $57.60

• $63.90

• $70.40

Multiple Choice

Macy's Department Store has a 30%-off sale this week. What is the sale price for a pair of $24.00 jeans?

• $2.40

• $7.20

• $16.80

• $21.60