Percent and Percent Change

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 percent change?

Back

Percent change is calculated by taking the difference between the new value and the old value, dividing by the old value, and then multiplying by 100.

Front

What is the formula for finding the original price before tax if you know the sales tax amount?

Back

Original Price = Sales Tax Amount / (Sales Tax Rate) where Sales Tax Rate is expressed as a decimal.

Front

If a price increases from $100 to $120, what is the percent increase?

Back

Percent Increase = ((New Price - Old Price) / Old Price) * 100 = ((120 - 100) / 100) * 100 = 20%.

Front

What does it mean to find a discount?

Back

Finding a discount means calculating the reduction in price from the original price.

Front

If you buy 3 items at full price and get the 4th free, what is the effective discount?

Back

The effective discount is 25% off the total price of 4 items.

Front

How do you find the total salary if you know a percentage of it?

Back

Total Salary = Amount / (Percentage as a decimal). For example, if $450 is 25%, then Total Salary = 450 / 0.25 = $1800.

Front

What is the relationship between percent and fractions?

Back

Percents can be converted to fractions by placing the percent over 100 and simplifying.

Front

How do you express a 10% increase in a number?

Back

To express a 10% increase, multiply the number by 1.10.

Front

What is the formula for calculating the final price after tax?

Back

Final Price = Original Price + (Original Price * Sales Tax Rate).