Calculators Effects >>> Compound Interest.


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		/* Visit http://www.yaldex.com/ 
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		<!-- Begin

		var 
		princ;

		var 
		ratepc;

		var 
		years;

		var 
		rate;

		var 
		power;

		function 
		calcAmt(frm)
		{

		princ 
		=
		eval(frm.pr.value);

		ratepc 
		=
		eval(frm.rt.value);

		years 
		=
		eval(frm.yr.value);

		rate 
		= 
		ratepc /
		100;

		power 
		=
		Math.pow((1
		+ 
		rate), 
		years);

		frm.amt.value
		=
		Math.round(princ
		* 
		power *
		100)
		/
		100;

		frm.inter.value
		=
		Math.round((frm.amt.value
		- 
		princ)
		*
		100)
		/
		100;

		}

		function 
		checkInput(frm)
		{

		if
		(rate
		==
		0
		|| 
		rate >
		.3)
		{

		window.alert
		("Are 
		you sure that the interest rate is "
		+ 
		ratepc +"%?");

		frm.rt.focus();

		}

		if
		(years
		==
		0
		|| 
		years >
		30)
		{

		window.alert
		("Are 
		you sure that the term is " 
		+ 
		years +
		" years?");

		frm.yr.focus();

		   
		}

		}

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		</script>

		<form
		method=get
		name=frm>

		Principal 
		<input 
		type=text
		name=pr
		size=10
		maxlength=10
		onChange=calcAmt(this.form)>

		Rate 
		<input 
		type=text
		name=rt
		size=6
		maxlength=6
		onChange=calcAmt(this.form)>

		Years 
		<input 
		type=text
		name=yr
		size=5
		maxlength=5
		onChange=calcAmt(this.form)>

		<br>

		<br>

		<input
		type=button
		name=calc
		value="Calculate"
		size=10
		onClick=checkInput(this.form);
		calcAmt(this.form);>

		<input 
		type=reset
		value="Clear">

		<br>

		<br>

		Amount 
		<input 
		type=text
		name=amt
		size=10>

		Interest 
		<input 
		type=text
		name=inter
		size=10>

		</form>