Exponential Growth & Decay: Real-World Word Problems

A population of rabbits doubles every year. If there are currently 50 rabbits, how many will there be in 3 years?

• 800

• 200

• 100

• 400

A car's value decreases by 15% each year. If the car is currently worth $20,000, what will its value be after 2 years?

• $12,000

• $14,450

• $16,000

• $17,000

A bacteria culture grows exponentially. If it starts with 200 bacteria and doubles every 4 hours, how many bacteria will there be after 12 hours?

• 1600

• 800

• 400

• 3200

A tree's height increases by 10% each year. If it is currently 5 meters tall, how tall will it be in 5 years?

• 7.2 meters

• 9.0 meters

• 8.05 meters

• 6.5 meters

A radioactive substance decays at a rate of 5% per hour. If you start with 100 grams, how much will remain after 3 hours?

• 90 grams

• 85.74 grams

• 75 grams

• 100 grams

A savings account earns 8% interest compounded annually. If you deposit $1,000, how much will you have after 5 years?

• 1500.00

• 1300.50

• 1200.00

• 1469.33

A certain species of fish decreases in population by 20% each year. If there are 1,000 fish now, how many will be left after 4 years?

• 800

• 250

• 410

• 600

A smartphone loses 25% of its value each year. If it was purchased for $800, what will its value be after 3 years?

• $250.00

• $450.00

• $337.50

• $600.00

A town's population is 10,000 and is growing at a rate of 3% per year. What will the population be in 4 years?

• 12000

• 10500

• 11255

• 11500

A certain type of mold grows at a rate of 50% every day. If you start with 10 grams, how much will you have after 3 days?

• 33.75 grams

• 50 grams

• 40 grams

• 20 grams