Multiply Every Input value Inside Form by 7 using JavaScript

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I am trying to multiply every Input value inside Form by 7 to make it a weekly data and 30 to make it monthly data on select from drop down.

My form is very big so I can’t do it one by one.

<select name="result_time" class="custom-select type" id="result_time" onChange=selectChange(this.value)>
          <option class="daily" value="Daily" selected="selected">Daily</option>
          <option class="weekly" value="Weekly">Weekly</option>
          <option class="monthly" value="Monthly">Monthly</option>
</select>
<form>
    <input type="text" class="form-control" readonly/>
     <input type="text" class="form-control" readonly/>
     <input type="text" class="form-control" readonly/>
     <input type="text" class="form-control" readonly/>
     ........ 
</form>

I tried this:

<script>
    function selectChange(val) {
        if(val == 'Weekly'){
            /* multiply every input by 7 */
            $('input').val(parseInt('input').val() * 7)
            /* I know it's not right but it turns all my input to same value */
        }
    }
</script>

Also I don’t want to multiply 7 every time user select weekly. How can achieve it in Form?

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