Rule of 72

Your returns (or interest rate) are 8% a year. How long before your investment doubles?

• 9 years
• 8 years
• 7 years
• Never

Tags

CCSS.7.RP.A.3

Your returns (or interest rate) are 9% a year. How long before your investment doubles?

• 9 years
• 8 years
• 7 years
• They won't

Tags

CCSS.7.RP.A.3

Your returns (or interest rate) are 6% a year. How long before your investment doubles?

• 18 years
• 16 years
• 12 years
• 8 years

Tags

CCSS.HSF.LE.A.4

Your returns (or interest rate) are 1% a year because they are in a savings account. How long before your savings doubles?

• 72 years
• 36 years
• 1 year
• They will never double

Tags

CCSS.HSF.LE.A.4

Who is the founder of the Rule of 72

• Mr. Gummo

• Albert Einstein

• Benjamin Franklin

• George Washington

Bryce invested $30,000 in his employee‐sponsored retirement account when he was 29 years old. He is now 65 years old and ready to retire. If he earned an average of 6% on the account, how many times did it double?

• 1

• 2

• 3

• 4

How many years will it take for an investment with 4.5% interest to double?

• 10

• 14

• 16

• 20