Unit 2 Part I: Financial House and Rule of 72

Samuel and his friends Mason, Priya, and Arjun are curious about their fixed deposit investments. What is the Rule of 72 primarily used for when they want to see their money grow?

• Calculating the time it takes for a population to double

• Determining the time it takes for their investment to double at a fixed annual interest rate

• Estimating the annual growth rate of their investment

• Calculating the exact interest earned on their investment over a year

Abigail and Harper are curious about how quickly their savings can grow! If Priya tells them about the Rule of 72 for estimating how long it takes for money to double in a savings account with a fixed interest rate, how can they use this rule to figure out the number of years it will take for their investment to double?

• 72 / interest rate = years to double

• Interest rate / 72 = years to double

• 72 * interest rate = years to double

• Interest rate * 72 = years to double

Ethan, Samuel, and Aiden are competing to see whose savings will double first! Ethan starts with $1,000 in a savings account that earns 6% interest per year. Using the Rule of 72, can you help Ethan figure out approximately how many years it will take for his investment to double?

• 6 years

• 12 years

• 18 years

• 24 years

Jackson, Aiden, and Abigail are learning about the Rule of 72 in their finance class. Which of the following is NOT a direct application of the Rule of 72?

• Estimating how long it takes for a country's GDP to double

• Calculating the time it takes for inflation to halve the value of money

• Determining the number of years it takes for a bond's value to double

• Predicting the exact date of stock market crashes

Imagine Ava and Jackson are curious about how quickly their savings could double just by earning interest! The Rule of 72 is a handy trick for this. What else can you use the Rule of 72 to calculate?

• The time it takes for a loan to double in amount due to interest

• The exact amount of interest earned on an investment in one year

• The number of times interest is compounded in a year

• The annual inflation rate based on price increase

Kai and Mia are competing to see whose savings will double first! If Kai invests $1,000 in a savings account with a 9% annual interest rate, use the Rule of 72 to estimate how many years it will take for his investment to double. Who will win the race to double their money?

• 6 years

• 8 years

• 10 years

• 18 years

Charlotte and her friends Liam, Abigail, and Benjamin are curious about how quickly their investments can double. When Charlotte uses the Rule of 72 to estimate this, why is it considered a rule of thumb rather than an exact calculation?

• It only applies to investments made in the stock market

• It uses an approximation to simplify complex compound interest calculations

• It can only be used for interest rates between 1% and 12%

• It was created before the invention of calculators and computers

Scarlett, Avery, and Rohan are on a quest to see who can double their savings the fastest! In which type of educational curriculum would they discover the Rule of 72 to help them with their calculations?

• History

• Science

• Mathematics

• Literature

Hannah, Noah, and Kai are having a friendly competition to see who can double their savings the fastest! Hannah suggests using the Rule of 72 to estimate how long it will take. What mathematical concept is the Rule of 72 based on to provide these estimates?

• Simple interest

• Compound interest

• Arithmetic progression

• Geometric progression

Abigail, Michael, and Evelyn are teaming up to tackle their finances! They've discovered a clever way to shrink their debt faster. What is this popular method called?

• Debt Stacking/Snowball

• Pay yourself first

• Is not how much you make, but how much you keep.

• Credit card statements