How to Multiply / Sum with Javascript : <p><a href="https://jsbin.com/wujusajowa/1/edit?html,js,output" rel="nofollow">https://jsbin.com/wujusajowa/1/edit?html,js,output</a></p>

<p>I can sum the numbers of options. Like (5+5+5=15)</p>

<p>But I don't know a way to multiply the input with the sum of selects.</p>

<p>For example, What should I do to do <strong>6 x</strong> (5+5+5) and get 90 ?</p>
