JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="plusOne()">Plus five cents</button>
<p id="amount">0 ¢</p>

JavaScript

var dollar = 0;
var cents = 0;

function plusOne() {
  if (cents < 95) {
    var cents = cents + 5;
    document.getElementById("amount").innerHTML = cents + " ¢";
  } else if (cents == 95) {
    var dollar = 1;
    document.getElementById("amount").innerHTML = dollar + " $";
  } else if (cents == 100) {
    var cents = 0;
    var dollar = dollar + 0.05;
    document.getElementById("amount").innerHTML = dollar + " $";
  }
}