Percentage Increase and Decrease Problems

This video tutorial covers solving problems related to percent increase and decrease using tape diagrams, equations, and reasoning. It includes examples such as calculating discounts, solving exercise program increases, and addressing temperature changes. The tutorial emphasizes understanding the problem context and applying appropriate mathematical strategies.

If an item originally costs $100 and is on sale for 20% off, what is the final price?

• $80

• $20

• $120

• $100

May increased her walking time by 20% on the third day. If she walked 30 minutes on the second day, how long did she walk on the third day?

• 42 minutes

• 24 minutes

• 30 minutes

• 36 minutes

If the temperature at midnight was -3°C and it doubled by morning, what was the temperature in the morning?

• 0°C

• -3°C

• 3°C

• -6°C

Diego uses a $3 coupon and then gets a 20% discount on the reduced price. If he pays $18.40, what was the original price?

• $18.40

• $23

• $20

• $26

A store had 100 pairs of flip-flops and sold some. If 3/5 of the remaining are blue and there are 39 blue pairs, how many pairs were sold?

• 35

• 61

• 39

• 65

If a backpack originally costs $25 and is now $21, what is the percentage discount?

• 16%

• 20%

• 25%

• 10%

What is the new price of a computer originally priced at $1000 after a 10% discount?

• $1100

• $1000

• $900

• $950

A tent's price increased by 25% and then a $10 coupon was applied. If the final price is $152.50, what was the original price?

• $162

• $152.50

• $132

• $142

If a store donates 50 pairs of shoes and sells 64% of the remaining, ending with 288 pairs, how many pairs did they start with?

• 750

• 850

• 800

• 900

A freshman class is 10% smaller than last year's class of 1000 students. How many students are in this year's class?

• 950

• 900

• 1000

• 1100