Compound Interest
Lena deposits $1,200 into a savings account that earns 5% simple interest per year. How much interest will she earn after 3 years?
Lena will earn $180 in interest.
A population of 1,000 bacteria doubles every 3 hours. How many bacteria will there be after 9 hours?
8,000 bacteria
A car worth $30,000 depreciates by 10% per year. What will it be worth after 4 years?
The car will be worth $19,683
A loan of $2,500 is given at a simple interest rate of 4% annually. How much total interest will be paid after 5 years?
The total interest paid after 5 years is $500.
A car’s value increases at a rate of 6% per year. If it’s worth $20,000 today, how much will it be worth in 5 years?
$26,764
A phone battery has 100% charge, but it loses 15% of its charge each hour. What percentage will be left after 3 hours?
61.4% battery will be left
Jordan invests $3,000 in a bank that pays 6% annual simple interest. How much will his investment be worth after 4 years?
His investment will be worth $3,720 after 4 years.
A city’s population is 500,000 and grows by 2% per year. What will the population be after 10 years?
609,500 people
A town's population of 80,000 decreases by 5% annually. What will the population be after 6 years?
about 58,808 people
A car dealer offers a financing plan where you pay simple interest of 7% annually. If you borrow $8,000 for 2 years, what is the total interest you will owe?
The total interest owed is $1,120.
An investment of $1,500 grows at a rate of 4.5% annually. How much will it be worth in 7 years?
$2,058
A medication is 200 mg when taken, but the body breaks down 20% of it per hour. How much remains after 5 hours?
65.5 mg of medication remains
Maria wants to earn $450 in interest from a simple interest account over 3 years. If the annual interest rate is 5%, how much should she deposit?
Maria should deposit $3,000.
A social media account has 200 followers and gains 12% more followers each week. How many followers will it have in 6 weeks?
395 followers
A rare book's value is decreasing by 8% each year. If it's currently worth $1,000, what will its value be in 10 years?
The book will be worth $422.80