Tds on salary (a.y-12-13)

could any one please help me

here is a salary detail of an employee

basic 14000

hra      7000

LTA     2800

medical 1250

transportation 800

internet excess allowance 800

telephone calls allowance  500

special performance payout monthly 2400

professional enrichment allowance 450

gross salary is 30000/- per month

please tell me how would i compute tax liability for f.y.11-12(a.y. 12-13)

and do we get exemption on HRA,Medical , transportation, and any other allowance?

tell me in detail please.......