My javascript loops through a set of tags and take in their innerText which contains floating numbers.

var total_amount = 0.00;

function update_totals() {
    total_amount = 0;
    tableRows = document.querySelectorAll('[id^="amount_"]');
    for (var i = 0, len = tableRows.length; i < len; i++) {
        total_amount = total_amount + parseFloat(tableRows[i].innerText).toFixed(2);
        
    }

    tax = parseFloat(total_amount * 5/100).toFixed(2);
    gross_amount = parseFloat(total_amount + tax);

    console.log(total_amount);
    console.log(tax);
    console.log(gross_amount);
}

My elements innerText is 3800.00 and 2599.99 But the console.log shows

03800.002599.99
Nan
3800.002599

Even after giving parseFloat it is considering the values as string.

Required Output

6399.99  //3800 + 2599.99
319.99   // 6399 * 5/ 100
6719.98  // sum of two numbers above