Can you detail the incident with the two gentlemen from Goa regarding the dakshina?

Chapter 36 recounts a story where two gentlemen from Goa came for Sai Baba's darshan. Both surrendered at his feet, but Sai's interaction with them regarding dakshina was perplexing to onlookers. He specifically asked for fifteen rupees from only one of the men, who gave it joyfully. However, when the second gentleman offered thirty-five rupees of his own accord, Sai Baba immediately rejected the offering. As detailed in the chapter, this apparent partiality surprised everyone present, including Madhavrao (Shama), who then questioned Sai about the seemingly unequal treatment of the two devotees.