Simple/Compound Interest
Sarah invests $1,000 at a simple interest rate of 5% per annum for 3 years. How much interest does she earn?
$150
A bacteria culture starts with 200 bacteria and doubles every hour. How many bacteria will there be after 3 hours?
1,600 bacteria
Factorise: x2+5x+6
(x+2)(x+3)
Solve (x+5)(x+7)=0
x=-5 x=-7
Mark deposits $2,500 in a savings account that earns simple interest at a rate of 4% per annum. How much money will Mark have in his account after 5 years?
$3,000
A car depreciates in value by 10% each year. If the car is currently worth $20,000, what will it be worth after 1 year?
$18,000
Factorise: x2-7x+10
(x-2)(x-5)
Solve (x-17)(x+6)=0
x=17 x=-6
Emily invests $5,000 at an annual interest rate of 6% compounded annually. How much will her investment be worth after 2 years?
$5,618
How many kids does Mr Urkin have?
Bonus - What are their names?
Maya and Lily
Factorise: x2-9x+18
(x-3)(x-6)
Solve 5(x-5)(x+1)=0
x=5 x=-1
A bank offers an annual interest rate of 8% compounded monthly. If John invests $2,000, how much will he have after 2 years?
$2,345.16
A substance decays by 25% each hour. If the initial amount is 80 grams, how much will be left after 2 hours?
45 grams
Factorise: 5x-15
5(x-3)
Solve x(x-9)=0
x=0 x=9
An amount of $1,500 is invested at an interest rate of 8% per annum, compounded monthly. Calculate the total amount after 2 years.
$1,757.55
A city's population is currently 50,000 and is growing at a rate of 3% per year. What will the population be in 5 years, assuming exponential growth?
Approximately 57,964
Factorise: 2x2+18x
2x(x+2)
Solve 5x(5-x)=0
x=0 x=5