7th Gr Final Review #2 - Ch 2 Percents

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 x 0.20 = 10.

Front

What is the formula for calculating sales tax?

Back

Sales Tax = Price of Item x Sales Tax Rate.

Front

If a computer costs $800 and the sales tax is 5%, what is the total cost?

Back

Total Cost = $800 + ($800 x 0.05) = $840.

Front

What is simple interest?

Back

Simple interest is calculated on the principal amount only, not on the interest accrued. The formula is: Interest = Principal x Rate x Time.

Front

How much interest will you earn on $1000 at a rate of 4% for 2 years?

Back

Interest = $1000 x 0.04 x 2 = $80.

Front

What does it mean to find the total amount after interest is applied?

Back

Total Amount = Principal + Interest.

Front

If you deposit $2000 in a bank account that earns 3% interest annually, how much will you have after 1 year?

Back

Total Amount = $2000 + ($2000 x 0.03) = $2060.

Front

What is the difference between a percent increase and a percent decrease?

Back

Percent increase measures how much a value has grown relative to its original amount, while percent decrease measures how much a value has shrunk.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and multiply by 100. For example, 1/4 = (1 ÷ 4) x 100 = 25%.