<?php

require './Conta.php';
require './ContaPoupanca.php';
$cp = new ContaPoupanca();
$cp->deposito(200);
$cp->virarMes();
$cp->saque(200);
echo $cp->pegarSaldo();
<?php

require './Conta.php';
require './ContaPoupanca.php';
$cp = new ContaPoupanca();
$cp->deposito(400);
$cp->calculaRendimento();
echo $cp->pegarSaldo();