What is my tds when my salary is Rs.20000 per month?

My company deducted Rs.4317 as TDS from my April months salary.I have joined this firm on 2009 june with a salary of Rs.17000 per month.There is no PF or any medical allowance in this company,but they deducted Rs.200 per month as professional tax also there is no salary account,every month my savings account with HDFC Bank shows as fund transfer from my branch.I got a salary increment of Rs.3000 in 2010 september and now my salary is Rs.20000 also the company gives me a daily allowance of Rs.175 per day and travelling expenses.But now the problem is that they have deducted Rs.4317 from my april 2011 salary as TDS.Is that a right amount if it is so,whether i get any reimbursement?I only have a mediclaim policy,and its premium is Rs.2300 per annum.Looking forward for a kind replay,Thank You.