Upland has a population of 15,000, of whom 9,000 work 8 hours a day to produce real output of $342,000. Lowland has a population of 8,000, of whom 7,000 work 7 hours a day to produce real output of $171,500. A. Upland has higher productivity and higher real GDP per person than Lowland. B. Upland has higher productivity but lower real GDP per person than Lowland. C. Upland has lower productivity but higher real GDP per person than Lowland. D. Upland has lower productivity and lower real GDP per person than Lowland.