yes, any overtime is included in gross salary
Include it on the cover letter. Answer. Don't. Say "Negotiable". If you write down a figure they will use it to weed you out. Salary history is much better.
No. Salary is a gross (without deductions) number. If they wanted to help you with the tax burden, they would simply raise your base pay.
no.
Yes because everything you earn is subject to tax, so what you get is the Net amount
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