What does he get from Anil in return for his work?
In return for his work, the boy does not get a regular salary, as Anil does not even pay him. Instead, he earns a small amount by cheating on the shopping. He takes his time buying the day’s supplies and keeps the extra money, usually making a profit of about a rupee a day.
Beyond money, he receives Anil's complete trust. Anil gives him a key to the door and lets him come and go as he pleases. He also receives an education, learning to write whole sentences, which he realizes is far more valuable than stealing a few hundred rupees.
Explanation
The question asks what the thief gets in return for his work for Anil. The text explicitly states that Anil does not pay him a salary. However, the thief makes a profit of about a rupee a day by cheating on the shopping. Additionally, the thief benefits from Anil's immense trust (evidenced by giving him a key) and an education in writing, which the thief acknowledges can bring him more long-term value than stealing.