Percent Increase and Decrease Problems

The video tutorial covers the concept of percentages, focusing on understanding 100% and using double number lines to solve problems related to percentage increase and decrease. It includes practical examples such as calculating gas tank capacity, popcorn bag size reduction, and population changes. The tutorial emphasizes the importance of identifying the 100% value to accurately determine percentage changes.

What does 100% represent in a double number line?

• A random value

• The original or whole value

• The largest value

• The smallest value

If a gas tank holds 12 gallons and another holds 50% more, how much does the second tank hold?

• 24 gallons

• 12 gallons

• 18 gallons

• 6 gallons

A school had 1,200 students last year and 1,080 this year. What is the percent decrease?

• 10%

• 20%

• 15%

• 25%

After a 25% discount, a t-shirt costs $12. What was the original price?

• $20

• $18

• $16

• $15

A population increased by 25% to 6,600. What was the original population?

• 6,200

• 5,500

• 5,280

• 6,000

A juice box originally held 12 ounces and now holds 20% more. How much does it hold now?

• 13 ounces

• 14.4 ounces

• 15 ounces

• 12 ounces

If a bakery used 240 kg of butter last month and 25% more this month, how much was used this month?

• 300 kg

• 280 kg

• 320 kg

• 260 kg

The price of oranges decreased by 20% from $1.75. What is the new price?

• $1.40

• $1.30

• $1.60

• $1.50

A herd of bison increased by 10% to 605. What was the original number?

• 555

• 500

• 550

• 600

Elena walked 12 miles and then 25% more. How far did she walk in total?

• 15 miles

• 18 miles

• 16 miles

• 14 miles