Assume real per capita GDP in West Springfield is $8,000 while in South Darlinia it is $2,000. The annual growth rate in West Springfield is 2.33%, while in South Darlinia it is 7%. How many years will it take for South Darlinia to catch up to the real per capita GDP of West Springfield?

A. About 10 years

B. About 30 years

C. About 40 years

D. About 120 years

E. South Darlinia will never be able to catch up with West Springfield

What will the income of the two countries be when it is equal??