Percent of Increase and Decrease

What is the percent increase represented by this tape diagram?

Your friend Alex had a dog named Spot that used to weigh 150 pounds. Alex didn’t buy enough dog food one week and started to feed the dog people’s food, such as lasagna. Spot gained 12% of his body weight that week. How much does Spot weigh now?

• 162 pounds

• 1,250 pounds

• 18 pounds

• 168 pounds

Enrollment in a recreational soccer league last year totaled 340 kids. This year the enrollment is up 20%. How many new kids are in the league this year?

• 270 new kids

• 34 new kids

• 410 new kids

• 70 new kids

Last year your parent’s restaurant served 18,000 customers. This year business increased by 720 customers. What was the percent increase of customers?

• 4%

• 25%

• 9.6%

• 18%

Your teacher invested in a stock at a price of $18 per share and sold the stock for $20 per share. What was the percentage of gains your teacher earned?

• 2%

• 11.1%

• 90%

• 0.9%

In a recent poll, 150 students said they want to see a salad bar added to the cafeteria compared to only 120 in a previous poll. What was the percent increase in students who said that they wanted a salad bar?

• 25%

• 30%

• 125%

• 20%

The amount of money you earned mowing lawns and dog sitting increased 34% this year. If you earned $500 last year, how much did your earnings increase this year?

• $670

• $34

• $170

• About $1,470

The median weekly salary of a person with a high school degree in the United States is $718 compared to $1,451 for someone with a Master’s degree from college. What is the percent increase for someone’s salary with a Master’s degree compared to a high school degree?

• About 1%

• About 102%

• About 49%

• 733%

To make a profit, stores sell items for more than they paid. The increase in price is called the markup. Suppose the store purchases basketballs for $25 each. Find the markup amount if the basketballs are sold for 28% over the price paid for them.

• $25

• $32

• $0.90

• $7

If a water tank that could hold 45 gallons of water is replaced by a tank that can hold 25% more, what is the capacity of the new tank?

• 11.25 gallons

• 70 gallons

• 56.25 gallons

• 33.75 gallons