Can you describe the puzzling incident with the two gentlemen from Goa that is introduced in Chapter 36?

Chapter 36 of the Shri Sai Satcharitra introduces a curious story involving two gentlemen from Goa who came for Sai Baba's darshan. Both men surrendered at Baba's feet with joy. However, the situation became puzzling when Sai Baba asked for Dakshina of fifteen rupees from only one of the men, which he gave happily. When the second gentleman, unasked, offered a larger sum of thirty-five rupees, Sai Baba immediately rejected it. This apparent partiality surprised everyone present, including Madhavrao (Shama), who was prompted to ask Sai Baba for an explanation for this seemingly unequal treatment of two devotees who had come together.