By what means did Joe think he could become rich?

Joe grew up in an orphanage. He envied rich people and decided when he grew up he could make much money.
    Joe was not clever and he failed all his school exams. " [17 A] I will either have to find a good job or I will have to become a thief, " Joe said to himself. He knew he would never find a well-paid job. For months Joe watched a bank out of town. He noticed when it had the fewest customers. He watched, waited and planned.
    One afternoon he found that only two tellers were on duty. "I will either succeed and be very rich or fail and go to prison, " said Joe. He was willing to take the risk. Then he walked in and pushed a demand note over the counter. [18B]The teller read it, turned pale and quietly opened a small safe behind him. He took out $ 50, 000 and placed the bank notes in Joe’s open bag. Then Joe ran as fast as he could.
    That night Joe had to bury the money in case the police caught him. He chose a deserted piece of land near the house, he was glad when the money was safely hidden in the ground.
    The next day he was woken by bangs on his door. He answered and there came two policemen. "Joseph Smith, you are under arrest for robbing a bank!"
    Joe protested in vain. [19A]The bank had hidden cameras and the whole raid had been photographed. Joe was caught and put into prison.
    Ten years later Joe was set free. He quickly made his way to the spot where he had buried the money.
    A big building had been built on the site.