Question: upland has a population of 15 000?
Answer: 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. Upland has higher productivity and higher real GDP per person than Lowland.