JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = 4.015,
    mult = a * 100,
    round = Math.round(mult),
    result = round / 100;

console.log("value = " + a);
console.log("mult = " + mult);
console.log("round = " + round);
console.log("result = " + result);
console.log("expected = 4.02");
console.log(Math.round(401.5));