HOMEWORK: Name ____________________________ Period ________Date __________ Chapter 5: Day 4 Percent Increase & Decrease Formula: |𝑁𝑒𝑤 𝑉𝑎𝑙𝑢𝑒 − 𝑂𝑙𝑑 𝑉𝑎𝑙𝑢𝑒|
∙ 100 = 𝑃𝑒𝑟𝑐𝑒𝑛𝑡 𝐶ℎ𝑎𝑛𝑔𝑒 𝑂𝑙𝑑 𝑉𝑎𝑙𝑢𝑒
Directions: Complete the table below to determine the percent increase or decrease. Problem Subtraction (new – old) 1. From 16 to 20 20 – 16 = 4 2. From 30 to 24 3. From 15 to 30 4. Division (by the old) Percent Answer Increase or Decrease? 25% increase From 35 to 21 5. From 40 to 46 6. From 90 to 72 !
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= 0.25 Directions: Complete the table below to determine the percent increase or decrease. 7. Anna makes 120 dolls each month to sell. This month, she increases the number of dolls she makes by 30%. How many dolls does Anna make this month? 8. Last year Shantell bought a car for $24,000. The current value of the car is $21,000. Find the percent decrease in the value of the car. 9. It costs Kerry $400 to build a tree house. He sells the tree house to Nannette and makes 48% profit. How much does Nannette pay for the tree house? 10. Janine had 75 necklaces to sell. By the end of the first week, there were only 57 necklaces left. By the end of the second week, there were only 38 necklaces left. a) Find the percent decrease in the number of necklaces by the end of the first week. b) Find the percent decrease in the number of necklaces from the end of the first week to the end of the second week. !
11. One day at a supermarket, 258 fruits were sold in the morning, and ! of the number of fruits sold in the morning were sold in the afternoon. The next day, the number of fruits sold in the afternoon increased by 20% compared to the number of fruits sold in the afternoon the previous day. Find the total number of fruits sold in the afternoon the next day. ~ Challenge ~ 12. Of the 280 granola bars that a bakery produces daily, 40% have nuts. How many more nut bars must the bakery produce so that the number of nut bars will increase by 25%? 13. The side length of a square is 30 cm. If the length of its sides is increased by 20%, find the percent increase in the area.