Q&A: Business

Is it permissible to work as salesman or cashier in shops that sell pornographic magazines? Is it permissible to deal in these kinds of magazines? Is it permissible to print them?

Is it permissible for a Muslim business owner to employ non-Muslims in his business even though there are Muslims who need jobs?

Many big companies and business in the West employ large numbers of employees who work in offices about whose ownership they have no idea. So what is the ruling on: 1. Praying in those offices and using the water for wudhu? 2. If praying there is problematic, what would become of past prayers said in those places?