Ratios, Proportions & Percents Flashcard

Front

What is a ratio?

Back

A ratio is a comparison of two quantities expressed as a fraction, indicating how many times one value contains or is contained within the other.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal. It can be used to solve for an unknown value.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (as a decimal). For example, 25% of 120 is 120 * 0.25 = 30.

Front

What is the formula to find the sale price after a discount?

Back

Sale Price = Original Price - (Original Price * Discount Percentage).

Front

How do you calculate sales tax?

Back

Sales Tax = Price of Item * Sales Tax Rate. Add the sales tax to the original price to find the total cost.

Front

What is a commission?

Back

A commission is a fee paid to an employee based on the sales they generate, usually expressed as a percentage of the sales amount.

Front

How do you calculate a tip?

Back

Tip = Total Bill Amount * Tip Percentage. For example, a 20% tip on a $44.20 bill is 44.20 * 0.20 = 8.84.

Front

What is the relationship between the number of people in line and waiting time?

Back

As the number of people in line increases, the waiting time typically increases, assuming a constant rate of service.

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, 17% becomes 0.17.

Front

What is the total cost of an item including tax?

Back

Total Cost = Price of Item + Sales Tax. For example, for a $10.50 item with a 7% tax, Total Cost = 10.50 + (10.50 * 0.07) = 11.24.