What is P.T slab- If I got only Rs.10200/-salary in feb month?

My Monthly salary is 9614/- from april-09 to Jan 10. For this period P.T. was deducted by employer is Rs.750/- per month. But in month of February i received LTA of Rs.1500/- That time emplyer dedected Rs.200/- from April to March. (April to Jan 200-175=25/-) Is it calculaton is right or wrong. Please help me.