Rule of 70 practice problems

Macroeconomics Unit 5. Try each one, then open the worked solution. The Credit Sprint app generates unlimited new versions with fresh numbers.

Problem 1.

Real GDP per capita grows 3.5% a year. Using the rule of 70, about how many years will it take to double?

Show solution

70 ÷ 3.5 = 20 years.

Problem 2.

Real GDP per capita grows 1% a year. Using the rule of 70, about how many years will it take to double?

Show solution

70 ÷ 1 = 70 years.

Problem 3.

Real GDP per capita grows 1% a year. Using the rule of 70, about how many years will it take to double?

Show solution

70 ÷ 1 = 70 years.

Problem 4.

Real GDP per capita grows 10% a year. Using the rule of 70, about how many years will it take to double?

Show solution

70 ÷ 10 = 7 years.

Problem 5.

Real GDP per capita grows 3.5% a year. Using the rule of 70, about how many years will it take to double?

Show solution

70 ÷ 3.5 = 20 years.

Problem 6.

Real GDP per capita grows 1% a year. Using the rule of 70, about how many years will it take to double?

Show solution

70 ÷ 1 = 70 years.