Unit 4, Proportional Relationships and Percentages

Front

What is a proportional relationship?

Back

A proportional relationship is a relationship between two quantities where the ratio of one quantity to the other is constant.

Front

How do you calculate sales tax?

Back

To calculate sales tax, multiply the total cost of the item by the sales tax rate (as a decimal). For example, if an item costs $35.50 and the sales tax is 4.5%, the tax is $35.50 * 0.045 = $1.60.

Front

What is 70% expressed as a decimal?

Back

70% expressed as a decimal is 0.7.

Front

What is 25% expressed as a fraction?

Back

25% expressed as a fraction is 1/4.

Front

How do you determine if a relationship is proportional?

Back

A relationship is proportional if the ratio between the two quantities remains constant.

Front

Back

Front

What does it mean to discount an item by a percentage?

Back

To discount an item by a percentage means to reduce its price by that percentage of the original price.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 45% becomes 0.45.

Front

What is the formula for finding the total cost after tax?

Back

Total Cost = Original Price + (Original Price * Sales Tax Rate).

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying the fraction by 100.