function sconto()
{
    var c = parseFloat (document.form1.capitale.value);
    var i = parseFloat (document.form1.tasso.value);
    var t = parseFloat (document.form1.tempo.value);
    var a = parseInt (document.form1.periodo.value);

var k= (c*i*t)/(a*100);
var totale = c*(1-((i/100)*(t/a)));
  document.form1.pre.value= Math.round(k*100)/100;
  document.form1.tot.value= Math.round(totale*100)/100;
  }
  
  function tasso()
{
    var x = parseFloat (document.form2.cap.value);
    var y = parseFloat (document.form2.sconto.value);
    var z = parseFloat (document.form2.temp.value);
    var w = parseInt (document.form2.per.value);

var tas= ((x-y)/(x*(z/w)))*100;
var tax= Math.round (tas*100)/100;
  document.form2.post.value=tax+"%";
  }