A purely competitive cotton producer can sell any quantity of cotton he produces for 10 per kg. His five acres of land show diminishing returns because some are better suited for cotton production than others. The first acre can produce 1000 kilograms, the second acre 900, the third 800, and so on.

1. How much revenue will each acre generate?

2. What are the total revenues for each acre (that is, total revenue from all acres)?

3. What are the marginal revenues for each acre?

4. If the marginal cost of planting and harvesting an acre is 7000 per acre for each of the five acres, how many acres should the agricultural company cultivate to maximize its profit (or to minimize its loss)?