CLASSWORK: Ratio and Proportionality Error Analysis Quiz

What is the constant of proportionality?

HINT: K = y/x

Abdul's bill at a restaurant is $28.65. He wants to leave and 18% tip for the waiter. What is the total amount Abdul should leave? Round to the nearest cent.

Noah bought a computer cartridge for $28.50. Sales tax on the cartridge was 6.5%.

What was the total amount that Noah paid for the cartridge?

A realtor earns 1.25% commission on the price of any home that she sells. Last month she sold two homes for a total of $750,000. How much money in commissions did the realtor earn last month?

A video game is on sale for 30% off the regular price of $50.

What is the sale price of the video game?

The constant of proportionality in a relationship is 0.5.

What equation represents this relationship?

• 0.5y = 2x

• y = 0.5x

• 0.5y = x

• y = x + 0.5

A jacket has a regular price of $80.

It is on sale for 10% off.

The sales tax is 7%.

What is the total cost of the jacket including tax?

What is the constant of proportionality?

HINT: k = y/x

Which table has a constant of proportionality of 3/2?

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What is the constant of proportionality for the table?