Doubling time in years is roughly 70 divided by a constant annual growth rate in percent. At 1.4 percent growth, about how many years to double?
Q1. Doubling time in years is roughly 70 divided by a constant annual growth rate in percent. At 1.4 percent growth, about how many years to double?
Answer: 50 years
Explanation: Using the Rule of 70: doubling time ≈ 70 ÷ growth rate (%) = 70 ÷ 1.4 = 50 years.