Percent Change Vocabulary

The amount subtracted from the original amount is called __________. (Select all that apply)

• Discount

• Mark-down

• Tax

• Tip

• Mark-up

An amount that is added to the original amount is called _______. (Select all that apply)

• Discount

• Mark-down

• Tax

• Tip

• Mark-up

In the formula - xk = y - the k stands for what? (Select all that apply).

• Constant of proportionality

• Rate of change (% or decimal)

• Original Amount

• New Amount

• Difference between original and new amounts

If the original and new amounts are used in the formula (xk = y), the resulting solution for k must be subtracted from 1 (or 100%) to get the actual rate of change.

• True

• False

Percent error can be a negative value.

• True

• False

An optional amount that can be added to a subtotal to show appreciation for good service is ______________.

• Discount

• Interest

• Tax

• Tip

A mandatory amount that is added to a subtotal based on city, county, state, and/or federal government rates is ________.

• Discount

• Interest

• Tax

• Tip

If an item costs $10 and has a 5% discount, the new amount would be ________.

• $15

• $9.50

• $5

• $50

If an item costs $20 and the tax rate is 8.5%, then the tax amount is ________. (Round to nearest hundredth, if necessary)

• $0.85

• $1.70

• $8.50

• $1700

The inside lane of a track is 400-meters. Students measure it and find that it is approximately 405-meters. What is their percent error?

• 0.0125%

• 125%

• 12.5%

• 1.25%