Understanding Sales Tax Calculations

The video tutorial teaches how to calculate the total cost of an item after sales tax using a double number line. It explains the relationship between percentages and decimals, and how to express the total cost using numeric and algebraic expressions. The tutorial also covers how to handle unknown prices and concludes with a review of the concepts.

What is the purpose of a double number line in understanding sales tax?

• To compare different items' prices

• To visualize percentages and decimals

• To determine the best time to buy an item

• To calculate the exact change needed

If Megan's computer costs $250, how much is 10% of the price?

• $35

• $30

• $25

• $20

How does Megan calculate the total cost of her computer including sales tax?

• By dividing the original price by 1.10

• By subtracting 10% from the original price

• By adding a fixed amount to the original price

• By multiplying the original price by 1.10

How does Megan represent 20% on the double number line?

• 0.20

• 2.00

• 0.10

• 0.02

What does the expression 1.10 x represent in Megan's calculation?

• The sales tax amount only

• The total cost including sales tax

• The discount on the computer

• The original price of the computer

If the sales tax is 10%, what is the decimal representation used in calculations?

• 0.01

• 0.10

• 1.00

• 0.90

How can Megan express the total cost if she doesn't know the price of the computer?

• By using the expression 0.90 x

• By guessing the price

• By using a fixed price

• By using the expression 1.10 x

What is the first step Megan takes when calculating the total cost with an unknown price?

• She estimates the price

• She writes 1 x to represent the original price

• She calculates the sales tax first

• She uses a calculator to find the total

What is the algebraic expression for the total cost if the sales tax is 7%?

• 0.07 x

• 1.17 x

• 1.07 x

• 0.97 x

What is the total cost of an item if the sales tax is 7% and the original price is x?

• 0.07 x

• 1.17 x

• 1.07 x

• 0.93 x