Who knows about the salary package offered to sales/BD guys in UAE? please also mention the industry if you can.

Use the Bayt.com site.
It provides a fairly good idea about the salary packages for different roles and in different countries.
You may also approach the local placement agencies to further explore.

Of course, You can use Use the Bayt.com site , noting that its such issue changable & sometime not accurate.

Hi, My friend has recently got a Job in a construction company as a BDE and he has1 year of B2B experience.
He has been offered a package of $2500-$3000 PM with Car, Food & accommodation.