JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://rawgit.com/eu81273/jsfiddle-console/master/console.js"></script>
JavaScript
let salarioLiquido = 0;
let salarioBruto = +prompt('Entre com o salário bruto');
if (salarioBruto < 300) {
salarioLiquido = salarioBruto * 0.95;
} else {
salarioLiquido = salarioBruto * 0.85;
}
console.log(`Salário líquido: ${salarioLiquido}`);