How to sum multiple select options?

Suppose you have more than 1 select option, and you want to add the value or price of all the selected option which you have select. How to achieve it ? To perform this task, just use the simple method of JS which has been given below.

Foremost create select option as you want then add the below JS in script tag.
 var sum_select = 0;
    $('select :selected').each(function() {
        sum_select += Number($(this).attr('price'));

In the above method we add the price, you can also use “value” instead of price or any those attribute which you want to add.