Percent Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

If a zoo has 130 exhibits and 30% contain birds, how many exhibits contain birds?

Back

39 exhibits contain birds.

Front

What is the percent of change if a ticket price increases from $100 to $120?

Back

20% increase.

Front

How do you calculate the discount amount on a $900 television with a 30% discount?

Back

The discount amount is $270.

Front

Is the percent of change always a markup or increase when something is on sale?

Back

False, it can also be a decrease.

Front

What is the formula to find the percent of a number?

Back

Percent = (Part/Whole) x 100.

Front

If 50% of a class of 20 students are girls, how many girls are there?

Back

There are 10 girls.

Front

What does a 30% discount mean?

Back

It means you pay 70% of the original price.

Front

How do you find the original price if an item is sold for $80 after a 20% discount?

Back

Original Price = Sale Price / (1 - Discount Rate) = $80 / 0.8 = $100.

Front

What is the relationship between fractions and percentages?

Back

A percentage is a fraction out of 100.