How to get a second value of 1 radio to output to my receipt

<input type="hidden" name="level" value="" />
    <label>     
     <input class="required" type="radio" value="Member" name="level" [[!+fi.level:is=`Member`:then=`checked="checked"`]] id="Member" data-cost="[[+seminar_cost_member_price_early]]" />
     Member
    </label>
    <label>
     <input class="required" type="radio" value="Student" name="level" [[!+fi.level:is=`Student`:then=`checked="checked"`]] id="Student" data-cost="[[+seminar_cost_student_price_early]]" />
     Student
    </label>
    <label>
     <input class="required" type="radio" value="Non-Member" name="level" [[!+fi.level:is=`Non-Member`:then=`checked="checked"`]] id="Non-Member" data-cost="[[!+seminar_cost_member_price_early]]" />
     Non-Member
    </label>

[[+seminar_cost_member_price_early]]

$hook->setValue('levelCost',$cost);

$cost = level; //create a placeholder "cost" by looking at "level" from the form
$hook->setValue('levelCost',$cost); //turn the above into a hook
return true; // fail if it's not true

$levels = array(
  'member' => 15,
  'student' => 10,
  'non-student' => 30,
);

$level = strtolower($hook->getValue('level'));
if (isset($levels[$level]) && ($levels[$level] > 0)) {
  $hook->setValue('levelCost', $levels[$level]);
} else {
  // either set a default value, or add an error
  return false;
}
return true;