How to get Values Like 1.1023

Question

This is My code But Output is zero

 

private decimal gstcal()

{

decimal tax,price,cal, tcal;

tax = Convert.ToDecimal(txtFtax.Text);  // Tax=5

price = Convert.ToDecimal(txtFamt.Text); // Price=20

cal = (tax / 100);

tcal = price * cal;

return tcal;

}