Hiring someone to herd sheep can earn 50 thousand a year.

How many/much? I don't know, but I can teach you how to do it. First, you list the cost and how much it costs to buy mutton. Then go to the market to see how much a sheep can sell. The second one (how much can a sheep sell-the money to buy sheep) * x-the money to take care of people = 50,000 yuan. How many sheep have you calculated with this X? Ask again if you don't understand!