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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
    <table>
        <tr>
            <td>
                <input type = "checkbox" onclick = "sumar()" /> 1
            </td>
            <td>SDERF</td>
            <td>22/05/2014</td>
            <td>22/10/2014</td>
            <td>150 días</td>
            <td class = "monto_cuota_lin">1,000.00</td>
            <td>30.00</td>
            <td>1,030.00</td>
        </tr>
        <tr>
            <td>
                <input type = "checkbox" onclick = "sumar()" /> 2
            </td>
            <td>SDERF</td>
            <td>22/06/2014</td>
            <td>22/10/2014</td>
            <td>120 días</td>
            <td class = "monto_cuota_lin">1,000.00</td>
            <td>30.00</td>
            <td>1,030.00</td>
        </tr>
    </table>
</body>
</html>
 
table, table *{
    border: .1rem lightgray solid;
}
 
function sumar(){
    var checks = document.querySelectorAll(":checked"),
        total = checks.length,
        suma = 0;
    for (var i = 0; i < total; i++){
        var celda = checks[i].parentNode,
            fila = celda.parentNode,
            monto = fila.querySelector(".monto_cuota_lin").innerHTML;
        monto = Number(monto.replace(",", ""));
        suma += monto;
    }
    alert(suma);
}
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Alexis88pro
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