<html><head><title>Simple Interest</title>

<script>

function do_it(){

var sP=((document.fm.fmP.value));
var sR=((document.fm.fmR.value));
var sT=((document.fm.fmT.value));
var sI=((document.fm.fmI.value));
var sA=((document.fm.fmA.value));

var P=(Number(document.fm.fmP.value));
var R=(Number(document.fm.fmR.value))/100;
var T=(Number(document.fm.fmT.value));
var I=(Number(document.fm.fmI.value));
var A=(Number(document.fm.fmA.value));

for (var j=0; j<10; j++)
{
if(sP.trim().length==0 || P<=0) {P=A-I;  if(R*T!=0) P=A/(1+R*T);  }
if(sR.trim().length==0 || R<=0) { {R=I/(P*T); if(A>=P) R=(A-P)/(P*T);}  }
if(sT.trim().length==0 || T<=0) { {T=I/(P*R); if(A>=P) T=(A-P)/(P*R);  }  }
if(sI.trim().length==0 || I<=0) {I=A-P; I=P*R*T;}
if(sA.trim().length==0 || A<=0) {A=P+I; A=P+P*R*T;}
}

//document.fm.fmP.value=P;
//document.fm.fmR.value=R*100;
//document.fm.fmT.value=T;
//document.fm.fmI.value=I;
//document.fm.fmA.value=A;

//P=Math.round(P*100)/100;
//R=Math.round(R*100)/100;
//T=Math.round(T*100)/100;
//I=Math.round(I*100)/100;
//A=Math.round(A*100)/100;

document.fm.results.value="";

document.fm.results.value="Present Value $"+P+"\n\n"+"Interest Rate "+R*100+"%\n\n"+"Time "+T+" year\n\n"+"Interest $"+I+"\n\n"+"Future Value $"+A;



if(P.toString()=="Infinity"||R.toString()=="Infinity"||T.toString()=="Infinity"||I.toString()=="Infinity"||A.toString()=="Infinity"||
P.toString()=="NaN"||R.toString()=="NaN"||T.toString()=="NaN"||I.toString()=="NaN"||A.toString()=="NaN") document.fm.results.value=document.fm.results.value+"\n\n INVALID INPUT!  WHY?"


}


</script>





<head>

<body bgcolor=#AAFFAA>
<br>
<font size=+2><b>Simple Interest Calculator</b></font>

<br><br>
<form name=fm>
Present Value P = $<input size=8 name=fmP></input>&nbsp;&nbsp;<br><br>
Annual Interest Rate R = <input size=8 name=fmR></input>%&nbsp;&nbsp;<br><br>
Time T = <input size=8 name=fmT></input>Years&nbsp;&nbsp;<br><br>
Interest Amount I = $<input size=8 name=fmI></input>&nbsp;&nbsp;<br><br>
Future Value A = $<input size=8 name=fmA></input>&nbsp;&nbsp;
<br><br>
<input type=button value="CALCULATE" onClick=do_it()></input>
<br><br>
<textarea name="results" cols="39" rows="18"></textarea>



</body>
</html>