Exponential growth and decay Quiz

Name: ______________________   Date: __________   Score: ____ / 10

10 questions. Calculator allowed. Show your working. steplyclass.com/algebra-1/exponential-growth-and-decay/quiz/

1. 1

   200 bacteria double every hour. How many are there after 5 hours?
   1. A) 200
   2. B) 2
   3. C) 2000
   4. D) 6400

2. 2

   80 mg of a medicine halves every hour. How much is left after 3 hours?

   Answer: ____________________

3. 3

   $1000 grows by 5% a year. How much is it after 3 years?
   1. A) $1157.63
   2. B) $1000
   3. C) $1157630
   4. D) $1150

4. 4

   A car worth $20000 loses 15% of its value each year. What is it worth after 3 years?

   Answer: ____________________

5. 5

   A town of 5000 people grows by 10% a year. How many people live there after 2 years?
   1. A) 6000
   2. B) 5000
   3. C) 605000
   4. D) 6050

6. 6

   A bike worth $800 loses 25% of its value each year. What is it worth after 2 years?

   Answer: ____________________

7. 7

   A lake has 6000 fish. The number falls by 20% each year. How many fish are there after 3 years?
   1. A) 48
   2. B) 307200
   3. C) 6000
   4. D) 3072

8. 8

   $2500 grows by 4% a year. How much is it after 5 years?

   Answer: ____________________

9. 9

   A phone worth $600 loses 30% of its value each year. What is it worth after 2 years?
   1. A) $29400
   2. B) $294
   3. C) $54
   4. D) $600

10. 10

    A video has 50 views. The views double every day. How many views are there after 6 days?

    Answer: ____________________