From 2006 to 2010, per capita real gross domestic product (GDP) in Japan grew an average of 0.46 percent per year. At that rate, according to the Rule of 70, in roughly how many years will the Japanese economy double in size?

152.17 years

Explanation:

The rule of 70 is used to calculate how long it would take the GDP of a country to double given its growth rate

Number of years it would take GDP to double = 70 / average annual growth rate

70 / 0.46% = 152.17 years

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