Unit 5 Flashcard Review Percents

Front

What is the formula to calculate simple interest?

Back

Simple Interest = Principal × Rate × Time

Front

If the principal is $500, the interest rate is 5%, and the time is 5 years, what is the interest earned?

Back

$125

Front

What does sales tax do to the original price?

Back

Sales tax is added to the original price.

Front

What does a discount do to the original price?

Back

A discount is subtracted from the original price.

Front

How do you calculate percent increase?

Back

Percent Increase = ((New Value - Old Value) / Old Value) × 100

Front

If the number of teachers increased from 24 to 30, what is the percent increase?

Back

25% increase

Front

What is 15% of a number if 6 is the result?

Back

To find the number, use the formula: Number = 6 / 0.15, which equals 40.

Front

What is the relationship between percent and fractions?

Back

Percent means 'per hundred', so 25% is equivalent to 25/100 or 1/4.

Front

How do you convert a fraction to a percent?

Back

Multiply the fraction by 100 and add a percent sign.

Front

What is the formula for calculating percent decrease?

Back

Percent Decrease = ((Old Value - New Value) / Old Value) × 100