how to do calculation?

Question

 


Rent   textbox 1000

Tax    textbox     123.6  

Grossrent  textbox 1123.6



i type the rent amount  from the rent calculate 12.36% for service tax.then add both rent and tax gives grossrent.

how to do that calculation.

Please help me.please give the code.


thanks,

Regards,

Narasiman P