Richland's real GDP per person is $10,000, and Poor land's real GDP per person is $5,000. However, Richland's real GDP per person is growing at 1 percent per year, and Poor land's is growing at 3 percent per year. Evaluate real GDP per person in the two countries after ten years and after 20 years. Determine how many years will it take Poor land to catch up to Richland?