Disposing of interest money

Q: A person accrues R50 of haraam interest in his bank account. From his wallet, he gives R50 in cash to a poor person with the intention of disposing of this accumulated interest in his bank account. Has he disposed of the R50 interest, noting that the actual ‘interest R50’ is still in his bank account?

Iddat of a woman whose husband passed away after childbirth

Q: What will be the "iddat" of a woman if her husband passes away and she has a 6 day old baby? It is in my knowledge that if the woman is pregnant then till delivery she is in iddat and in normal cases it would be 4 months and 10 days. But my question is this that just 6 days before the death of the husband she delivered. So is there no iddah and she will be "paak or tahira" in 40 days. Or she will complete 4 months?

Sunnah method of dua after fardh Salaah

Q: What is the correct manner of reading the dua after Salaah with regard to reading it loud or soft. Should the dua be made audible (loud) or inaudible (soft)? In our musjid the Imaam starts the duaa loud and reads the first part loud then remains silent and reads the duaa silently, thereafter he reads the ending of the duaa loudly again. Is this correct or is it a bid'a?