Percent Unit Review

Front

What is the formula to calculate the final cost of an item after a discount and sales tax?

Back

Final Cost = (Original Price - Discount) + Sales Tax

Tags

CCSS.6.RP.A.3B

Front

How do you calculate the percentage decrease in price?

Back

Percentage Decrease = ((Original Price - New Price) / Original Price) * 100

Tags

CCSS.6.RP.A.3C

Front

What is simple interest and how is it calculated?

Back

Simple Interest = Principal × Rate × Time

Tags

CCSS.7.RP.A.3

Front

If an item is on sale for a certain percentage off, how do you find the sale price?

Back

Sale Price = Original Price - (Original Price × Discount Percentage)

Tags

CCSS.6.RP.A.3C

Front

What does a 5% interest rate mean in terms of earnings on a deposit?

Back

It means for every $100 deposited, $5 will be earned in interest per year.

Front

How do you find the interest rate if you know the interest earned, principal, and time?

Back

Interest Rate = (Interest Earned / (Principal × Time)) × 100

Tags

CCSS.7.RP.A.3

Front

What is the relationship between principal, interest rate, and time in simple interest?

Back

The total interest earned is directly proportional to the principal amount, interest rate, and time.

Tags

CCSS.7.RP.A.3

Front

If a TV originally costs $500 and is marked down to $413, what is the dollar amount of the discount?

Back

Discount = Original Price - Sale Price = $500 - $413 = $87

Tags

CCSS.7.EE.B.3

Front

How do you determine how long it will take to double an investment at a fixed interest rate?

Back

Using the formula: Time = (2 × Principal) / (Principal × Rate) or the Rule of 72.

Tags

CCSS.HSF.LE.A.4

Front

What is the final cost of an item after applying a 15% discount and a 6% sales tax?

Back

Final Cost = (Original Price - Discount) + Sales Tax, calculated step by step.

Tags

CCSS.6.RP.A.3C