<!DOCTYPE html>
<html lang ="pt-br">
<head>
<meta charset ="UTF-8">
<title> Soma Checkbox</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>
</head>
<body>
<form action="">
<input type="checkbox" name="valor1" id="preco" value= 25.00>Ahu <br/>
<input type="checkbox" name="valor2" id="preco" value= "36.00">Batel<br/>
<input type="checkbox" name="valor3" id="preco" value= "44.00"> Bacacheri<br/>
<input type="checkbox" name="valor4" id="preco" value= "120.00">
Alto XV<br/>
<input type="text" name="resultado" id="result" value= "0.00">
</form>
</body>
<script>
function somar() {
var result = $("input:checked");
var total = 0;
for (var i=0; i<result.length; i++)
{
total = total + parseFloat(result[i].value);
}
$("#result").val(total.toFixed(2));
}
somar();
$(":checkbox").click(somar);
</script>
</html>