function calcolaRendite()
{

var ren1 = document.getElementById("R1").value;
var ren2 = document.getElementById("R2").value;
var ren3 = document.getElementById("R3").value;
var ren4 = document.getElementById("R4").value;
var ren5 = document.getElementById("R5").value;

var ren1 = parseFloat(ren1);
var ren2 = parseFloat(ren2);
var ren3 = parseFloat(ren3);
var ren4 = parseFloat(ren4);
var ren5 = parseFloat(ren5);

var V1 = Math.round(ren1*115.50*100)/100;
var V2 = Math.round(ren2*126*100)/100;
var V3 = Math.round(ren3*42.84*100)/100;
var V4 = Math.round(ren4*63*100)/100;
var V5 = Math.round(ren5*112.50*100)/100;

var T1 = document.getElementById("testo1").value;
var T2 = document.getElementById("testo2").value;
var T3 = document.getElementById("testo3").value;
var T4 = document.getElementById("testo4").value;
var T5 = document.getElementById("testo5").value;

var SOM1 = document.getElementById("somma1").value;
var SOM2 = document.getElementById("somma2").value;
var SOM3 = document.getElementById("somma3").value;
var SOM4 = document.getElementById("somma4").value;
var SOM5 = document.getElementById("somma5").value;

var SOM1 = parseFloat(SOM1);
var SOM2 = parseFloat(SOM2);
var SOM3 = parseFloat(SOM3);
var SOM4 = parseFloat(SOM4);
var SOM5 = parseFloat(SOM5);

var TOT = document.getElementById("totale").value;
var TOT = parseFloat (TOT);

if (V1>0)
    T1=T1 + ren1 + "(" + V1 + ")" + " -";
if (V2>0)
    T2=T2 + ren2 + "(" + V2 + ")" + " -";
if (V3>0)
    T3=T3 + ren3 + "(" + V3 + ")" + " -";
if (V4>0)
    T4=T4 + ren4 + "(" + V4 + ")" + " -";
if (V5>0)
    T5=T5 + ren5 + "(" + V5 + ")" + " -";

SOM1 += V1;
SOM2 += V2;
SOM3 += V3;
SOM4 += V4;
SOM5 += V5;

TOT = SOM1 + SOM2 + SOM3 + SOM4 + SOM5;

document.getElementById("R1").value = 0;
document.getElementById("R2").value = 0;
document.getElementById("R3").value = 0;
document.getElementById("R4").value = 0;
document.getElementById("R5").value = 0;

document.getElementById("testo1").value = T1;
document.getElementById("testo2").value = T2;
document.getElementById("testo3").value = T3;
document.getElementById("testo4").value = T4;
document.getElementById("testo5").value = T5;

document.getElementById("somma1").value = SOM1;
document.getElementById("somma2").value = SOM2;
document.getElementById("somma3").value = SOM3;
document.getElementById("somma4").value = SOM4;
document.getElementById("somma5").value = SOM5;

document.getElementById("totale").value = TOT;

}