Question

what efforts does the narrator make to get his loan of one dollat repaid? what do u find humorous in his efforts?

Answer 1

When Todd came back to  the city after three weeks, they went to the club nearby in hopes to remind him of the dollar. They took a taxi together and than he asked about the currency value in terms of a dollar. He even asked whether he put an account of the spending on trip. He asked about his well being and settlement too.  and the narrator understood that todd has totally forgotten about the dollar the narrator lent 

Answer 2

The author tried to remind Todd about the loan in many ways. He went to receive him at the railway station when he returned from Bermuda. On another occasion during an evening chat he asked Todd if the dollar was in circulation in Bermuda also. The writer met his friend almost every day in the Club but Todd never mentioned about the dollar and one day went to the extent of saying that he had almost forgotten about his Bermuda trip. One day when Todd talked disapprovingly about Poland which had defaulted in its debts, the author hoped that he would remember his own debt. But was disappointed to know that it did not remind Todd of his unpaid debt.    

It is humorous because though the author is so anxious to get back his loan he tries his best not to reveal his anxiety to his friend and also tells the reader to keep it a secret from him.