JSFiddle - React, Tailwind, and code Playground

HTML

<input class='radio' type="radio" name="highlight" data-price="25.1" value="a1">a1
<input class='radio' type="radio" name="highlight" data-price="55.4" value="a2">a2
<input class='radio' type="radio" name="highlight" data-price="65.3" value="a3">a3
<input class='radio' type="radio" name="highlight" data-price="95.9" value="a4">a4
<input id="price" type="text">

JavaScript

var inputs = document.getElementsByClassName('radio');
var textbox = document.getElementById('price');
var i
for (i = 0; i < inputs.length; i++) {
	inputs[i].onclick = function(){
  	textbox.value = this.dataset.price;
  }
}