Using the Rule of 70, how many years would it take for a country's GDP to increase from $100 billion to $400 billion if it grows at 10% per year? 21 years 7 years 14 years 28 years

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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Using the Rule of 70, how many years would it take for a country's GDP to increase from $100 billion to $400 billion if it grows at 10% per year? 
  • 21 years 
  • 7 years 
  • 14 years
  • 28 years
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