7th - Proportionality & Percents Fall 2024 Semester Review

Front

What is the formula to calculate the final price after tax?

Back

Final Price = Original Price + (Original Price × Sales Tax Rate)

Front

If a jacket originally costs $120 and is on sale for 30% off, how do you calculate the sale price?

Back

Sale Price = Original Price - (Original Price × Discount Rate) = $120 - ($120 × 0.30) = $84

Front

What is commission in a sales context?

Back

Commission is a fee paid to a salesperson for their services, usually calculated as a percentage of the sale.

Front

How do you calculate the interest earned on a deposit?

Back

Interest = Principal × Rate × Time

Front

What does it mean for a relationship to be proportional?

Back

A relationship is proportional if two quantities maintain a constant ratio.

Front

How do you find the constant of proportionality?

Back

Constant of Proportionality = y/x, where y is the dependent variable and x is the independent variable.

Front

What is 9% of $990?

Back

9% of $990 = $990 × 0.09 = $89.10

Front

If Shelley sells a home for $127,000 and earns a 7% commission, how do you calculate her commission?

Back

Commission = Sale Price × Commission Rate = $127,000 × 0.07 = $8,890

Front

What is the total amount after 5 years if $200 is deposited at 5% interest?

Back

Total Amount = Principal + Interest = $200 + ($200 × 0.05 × 5) = $200 + $50 = $250

Front

What is the difference between simple interest and compound interest?

Back

Simple interest is calculated only on the principal amount, while compound interest is calculated on the principal plus any interest earned.