Calculating Total Cost with Sales Tax Using a Double Number Line

What does the double number line help us visualize?

• The relationship between different currencies

• The relationship between sales tax and discounts

• The relationship between percentages and decimals

• The relationship between fractions and whole numbers

If Megan's computer costs $250 and the sales tax is 10%, what is the total cost?

• $250

• $260

• $275

• $300

What does the blue bar on the double number line represent in Megan's example?

• The original price of the item

• The sales tax amount

• The discount on the item

• The total cost including sales tax

How can Megan express the total cost of her computer using decimals?

• 0.10 times 250

• 1.10 times 250

• 0.90 times 250

• 1.00 times 250

What is the algebraic expression for the total cost of an item with a 10% sales tax?

• x + 0.10

• 1.10x

• 0.90x

• x - 0.10

If the sales tax rate is 7%, how would you write the expression for the total cost?

• 0.07x

• 1.70x

• 1.07x

• 0.70x

How is 100% of an unknown price represented in an algebraic expression?

• 0.10x

• 1x

• 10x

• 0.01x