Question

name
you may use a calculator but write your steps down on this paper.
percent increase and decrease

1. a trail in broward county has 120 trees providing shade. the city plants 40% more trees. how many trees are on the trail now?
2. a park ranger counted 60 alligators in a canal. after a dry spell, the count decreased by 20%. how many alligators remain?
3. volunteers at a beach cleanup collected 150 pounds of trash. next week, they hope to increase their collection by 30%. what is their goal?
4. the temperature was 90°f at noon. by 6:00 pm, it decreased by 10%. what is the new temperature?
5. a beach had 80 turtle nests last year. this year, the number increased by 45%. how many nests are there now?
6. a player made 40 free throws last season. this season, her accuracy increased by 15%. how many did she make this year?
7. a soccer ball costs $10. it is on sale for 45% off. what is the final price?

Explanation:

Step1: Calculate 40% of 120

$120 \times 0.40 = 48$

Step2: Add to original tree count

$120 + 48 = 168$

Step1: Calculate 20% of 60

$60 \times 0.20 = 12$

Step2: Subtract from original alligator count

$60 - 12 = 48$

Step1: Calculate 30% of 150

$150 \times 0.30 = 45$

Step2: Add to original trash collection

$150 + 45 = 195$

Step1: Calculate 10% of 90

$90 \times 0.10 = 9$

Step2: Subtract from original temperature

$90 - 9 = 81$

Step1: Calculate 45% of 80

$80 \times 0.45 = 36$

Step2: Add to original nest count

$80 + 36 = 116$

Step1: Calculate 15% of 40

$40 \times 0.15 = 6$

Step2: Add to original free throw count

$40 + 6 = 46$

Step1: Calculate 45% of 30

$30 \times 0.45 = 13.50$

Step2: Subtract from original price

$30 - 13.50 = 16.50$

Answer:

1. 168 trees
2. 48 alligators
3. 195 pounds of trash
4. $80^\circ\text{F}$
5. 116 turtle nests
6. 46 free throws
7. $\$16.50$