<table class="table table-striped table-dark" id="table">
    <tr>
        <th scope="col">Symbol</th>
        <th scope="col">Name</th>
        <th scope="col">Shares</th>
        <th scope="col">Price</th>
        <th scope="col">Total</th>
    </tr>
    <tr>
        <td>GOOGL</td>
        <td>Alphabet, Inc.</td>
        <td>2</td>
        <td>$1,104.51</td>
        <td class="subtotal">$2,209.02</td>
    </tr>

    <tr>
        <td>NFLX</td>
        <td>Netflix, Inc.</td>
        <td>3</td>
        <td>$363.52</td>
        <td class="subtotal">$1,090.56</td>
    </tr>

    <tr>
        <td>AAPL</td>
        <td>Apple, Inc.</td>
        <td>3</td>
        <td>$197.87</td>
        <td class="subtotal">$593.61</td>
    </tr>

    <tr>
        <td>CASH</td>
        <td></td>
        <td></td>
        <td></td>
        <td class="subtotal">$6,122.81</td>
    </tr>
</table>

---------------------------------------

        var table = document.getElementById("table")
        let sum = 0;

        for(var i = 1; i < table.rows.length; i++)
        {
            alert(parseInt(table.rows[i].cells[3].innerHTML));
        }

        /*document.getElementById("table").innerHTML = "<tr><td></td><td></td><td></td><td></td><td>" + sum + "</td></tr>";
        */