public function exchange($price, $baseCurrency, $toBeExchanged)
{
    $exchangeRate = $this->list[$baseCurrency->getCode()]->getExchangeRates()[$toBeExchanged->getCode()]->getRate();
    $formattedRate = round($exchangeRate, 2);
    $total = $price * $formattedRate;
    return $total;
}