calculate the doubling time.\n$\\frac{70}{r \\text{ (growth rate)}} = \\text{doubling time}$\n$r \\text{…

calculate the doubling time.\n$\\frac{70}{r \\text{ (growth rate)}} = \\text{doubling time}$\n$r \\text{ (growth rate)} = 2\\%$\n98 years\n140 years\n35 years

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