Actually, I got this dha dha from one of humayun ahmads novel. The name of the novel is "Pakhi amar akla pakhi". Anyway, the novel does not say the answer for the dha dha. My answer is this: the father gave $50 to his son and $100 more to his both child to share. That is how they are given total of $150. So Ferdous bhai ar biral chok bhai er ta amar tar shathe mile.
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