Service tax

Company PAPPU Prepare a Invoice for Civil & Erection Suppose the invoice value is 100 Basic Value= 100.00 Add Service Tax= 10.30 ------------------------------------- Total 110.30 Less TDS 2.20 Less WCT 4.40 ---------------------------------------------- Receivable 103.70 Less Advance 10.00 S.Tax already charged against Advance Less Ret'n 10.00 ------------------------------------------------- Net Receivable 83.70 and received the amount rs.83.70 Now in which amount we pay service tax . Please explain