JSFiddle - React, Tailwind, and code Playground

HTML

<table id="tableGiftsWhiteRose"><tr>
  <td colspan="2">White Rose</td></tr><tr>
  <td><input type="checkbox" class="giftsRosesCheckBox" value="100"/></td>
  <td class="credits">100 credits</td> 
</tr></table>

<table  id="tableGiftsRedRose"><tr>
  <td colspan="2">Red Rose</td></tr><tr>
  <td><input type="checkbox" class="giftsRosesCheckBox" value="130"/></td>
  <td class="credits">130 credits</td>      
</tr></table>

<table><tr>
  <td colspan="2">Stunning Red Rose</td></tr><tr>
  <td><input type="checkbox" class="giftsRosesCheckBox" value="150"/></td>
  <td class="credits">150 credits</td>      
</tr></table>

   <button type="button">total?</button>

JavaScript

$('button').click(function() {

    var total = $(':checkbox:checked.giftsRosesCheckBox').get().reduce(function(total, checkbox) {
        return total + +checkbox.value;
    }, 0);
    alert(total);
});