Selling musical instruments

Q: I am in the business of selling sound equipment like speakers, mixers, and amplifiers. To remain competitive. I feel the need to offer a wider range of products, including musical instruments, despite knowing that music equipment may be considered haram. Given this, I have a few concerns: 

1. Is it permissible to sell musical instruments under these circumstances? 

2. If the income from selling such items is haraam, can I use that money to pay taxes? 

3. If selling musical instruments for profit is not permissible, would it be acceptable to sell them at cost price just to stay competitive in the market?

Wearing the niqaab even though one's family may disagree

Q: I just applied for a part-time job and they require that I remove my pardah (niqaab). I usually do not wear it in my home town due to my home situation as a revert and my family is against it and out of respect for them I do not wear it. However I made the intention to wear it full time even though my family would still disagree. 

My question is: What is the ruling on this and would it be advisable to wear it even though it may cause arguing and tension at home, and should I ever take off my niqaab (in future) for the sake of a job?

Occasionally omitting the sunnah ghair muakkadah before Asr and Esha Salaah

Q: We know it is sunnah to read 4 rakaat salaah before the Asr and Esha Salaah. Will it also be sunnah to purposely leave out these sunnah salaah SOMETIMES, as it is Sunnah Ghair Muakkada. 

Ezample, a person reads the 4 sunnah of Asr on Monday and purposely leaves it out on Tuesday and reads it again on Wednesday. Will this be regarded as a sunnah?

Working for a company that scams people

Q: I am working under a company which scam people but my job is to give them money and send them to the other people who will soon scam them. 

What should I do? I need to spend at least 6 months here to go back to my country or I need to pay them 1700$ to get my passport + I need ticket money too. So I have no idea what to do. Please guide me through this difficult time.