Exercise 3. Time to double Assume that in a specific country GOP per capita, or per worker, grows at the rate g each year over many years, where g is written as a percentage, e.g. 2 per cent. Show that GOP per capita, or worker, will then approximately double every 70/g years. Use this to set up a table showing for each of the 15 richest countries in the world in 1998, the country's average annual growth rate in GOP per worker from 1960 to 1998 (you can take these from Table 2.2), and the number of years it takes for the country's GOP per worker to double, if growth continues at the same rate as it averaged from 1960 to 1998.