xxxxxxxxxx
<script>
let selected = '20';
</script>
<label>
<input bind:group={selected} type="radio" name="amount" value="10" /> 10
</label>
<label>
<input bind:group={selected} type="radio" name="amount" value="20" /> 20
</label>
<label>
<input bind:group={selected} type="radio" name="amount" value="30" /> 30
</label>
{selected}