Gankhu gives it back and The Black Bull- All Issues

Gankhu sees that his father is unhappy. The landlord is being unfair to the farmers and paying them less. How will Gankhu teach the greedy landlord a good lesson? Badka Devi was a generous old woman. When she was gifted a little black calf, she took care of it as if it were her child. The calf grew up to be a mighty bull and wanted to help Badka Devi live comfortably. How did the bull earn money and help her?