Where you have not shown the Service tazx amount separately on the receipt issued by you to the customer servicetax liability would be as follows:
Normal rate of service tax = 10%
Rate net of abatement = 5%
Net rate including EC & SHEC = 5.15%
Service Tax calculation:
= Gross amount received x Rate of tax / (100 + Rate of Tax)
In your case as total receipt is Rs.29500/- (inclusive of ST) the calculation will be as follows:
= Rs. 29500 X 5.15 / (105.15)
= Rs.1445/-