The following table shows the average annual growth rate in real GDP per capita for Argentina, Ghana, and South Korea using data from the World Bank, World Development Indicators, for the past few decades. 

a. For each 10-year period and for each country, use the Rule of 70 where possible to calculate how long it would take for that countryʼs real GDP per capita to double.

b. Suppose that the average annual growth rate that each country achieved over the period 2008–2018 continues indefinitely into the future. Starting from 2018, use the Rule of 70 to calculate, where possible, the year in which a country will have doubled its real GDP per capita.

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Years 1968-1978 1978-1988 1988-1998 1998-2008 2008-2018 Average annual growth rate of real GDP per capita Argentina 1.21% -0.25 2.13 1.52 -0.16 Ghana -0.34% -1.64 1.50 2.71 4.12 South Korea 9.02% 7.47 5.59 5.10 2.55