title: How to Multiply / Sum with Javascript
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  <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>