ANSWER: Any money earned through haram means such as riba, bribes, stealing, selling prohibited things etc, and yes the dua of a person is not accepted who earns haram.

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ANSWER: It depends on the bank.  If it’s a conventional riba based bank then it’s totally prohibited to work there and the income is haram as well. 

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ANSWER: There’s no specific dua mentioned, just make general dua during times of acceptance, such as in salah in your sujood, in the last tashahud, before making salam, between Azaan and iqama, during the last third of the night, begging Allah until He opens the door and answers your dua.   

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