Summarize the brief story of the two gentlemen from Goa and Madhavrao's reaction to the events.

The story, which begins in Chapter 36, involves two gentlemen from Goa who came for Sai Baba's darshan. Both men joyfully surrendered at his feet. The narrative then focuses on their offerings. Sai asked for exactly fifteen rupees in Dakshina from one of the men, which was given happily. When the second man, unprompted, tried to offer thirty-five rupees, Sai Baba immediately refused to accept it. This unequal treatment was puzzling to those who witnessed it. Madhavrao, also known as Shama, was present and, seeing this apparent partiality, was greatly surprised. As the chapter concludes this initial part of the story, it notes that Shama proceeded to ask Sai about this puzzling behavior.