22. Real GDP per person in the country of Flip is $10,000, and the growth rate is 10 percent a year. Real GDP per person in the country of Flap is $20,000 and the growth rate is 5 percent a year. When will real GDP per person be greater in Flip than in Flap?

A) in 2 years

B) in 15 years

C) never

D) in 10 years

E) in 7 years