1)A bicycle tire factory produced 1,000 units in 2019, 1,600 in 2010, and promises to produce 2,000 this year. In 2019, 10 people worked in the factory, 15 in 2020 and 20 now. What was the average and marginal productivity per worker in each year?

2)

If the Government decides to sell a town with 500 homes that it had built in 2015 and that had cost it $ 40 million each (in today's currency), and manages to sell them for $ 50 million each, by how much will GDP increase in 2021 ?