Nafil fasts

Q: Besides the Monday and Thursday fast, what are some other days that one should keep Nafl Fast? I have heard people say that one should fast on Ashura, and 15th of Shaban (Shab-E-Baraat), and on the birthday of Rasulullah (Sallallahu Alayhi Wasallam)? Are any of these correct or should these be avoided?

Depositing trust money into interest bearing accounts

Q: I am asking a question on behalf of a trust who runs musjids and madressas, schools and clinics. We had a executive committee meeting in which couple of members said to deposit excess money which we have in an interest bearing account and use that money for Roads, Toilets, Walls, etc. There was disagreement, most members disagreed and but was agreed to ask Mufti to address the question.

Travelling in the state of haidh

Q: My question is regarding a woman in haidh. If a woman is in haidh and she is going to travel, will the conditions of salaah apply to her? When she reaches her destination, and she becomes tahirah, will she read qasr salaah or she will first have to travel a safr distance from there in order to read qasr or will she have to count the number of days she will be staying there from the day she becomes pure inorder to read qasr? Kindly send me the reference as well.

Buyer receiving the wrong item and refunding

Q: Person B sees advert of person A, and a successful transaction takes place. Upon person B receiving the goods, he notices that the contents do not match what was advertised. After querying from person A and requesting a refund, person A claims to have been scammed by person A's supplier (who has since disappeared) and refuses to refund person B. Who is responsible and who should suffer a loss? Keeping in mind that person A had failed to check the contents after receiving it from his supplier.