Re: Anyone wants to become Billionaire … Pakistani Style?
Pakistani politicians do not take (and eat) interest because they do not save (to take interest … iss kee naubat hee nahi atee inhay). 
They are always borrowers, and do not give (pay) interest on money they borrowed … they are true Muslims … believe on ‘no interest on money they borrow’ … ask Shareef Brothers 
Even though Kanjar Politicians do not tell where they invested borrowed money, as officially the destination is always different than in reality, I put down ‘defence saving certificates’ … but when politicians buy them they buy ‘bearer certificates’ so no one knows that they took interest or even have them (to save Zakat, when en-cashing their certificates, they declare they are non-Muslim). Other method of investment is to buy plots again not in their own name … or … they move the money abroad without anyone knowing about it (then buy properties abroad or keep the money in western banks earning interest).
Note: Curtsey to Kanjar politicians in power enacting laws and economic policies, Pakistan is probably only country in the world where one can invest in government guaranteed securities without declaring their name (hence bearer certificates).