Suppose that real GDP per capita of the United States is $32,000 and its growth rate is 2% per year and that real GDP per capita of China is $4,000, and its annual growth rate is 7%. According to the rule of 70, how large will China's real GDP per capita be in 20 years?

China' s real GDP per capita would be $16,000 in 20 years

Explanation:

Rule of 70, states that divide 70 with the growth rate and will get the time it will take, for an amount to get twice its present value.

After 10 years,

China's GDP would be the twice of GDP per capita.

In numerical terms

= 2 * GDP per capita

So, after 20 years, it would be 4 * GDP per capita

Therefore,

= 4 * $4,000

= $16,000