<head>
<h1>Currency</h1>
</head>
<body>
<script>
let typeCurrency = prompt("Enter currency type").toLowerCase();
rate = 1.0;
let isBuy = confirm("Sale?");
if (typeCurrency === "usd")
rate = isBuy ? 40 : 43;
else if (typeCurrency === "eur")
rate = isBuy ? 39 : 41;
else if (typeCurrency === "pln")
rate = isBuy ? 7.5 : 7.8;
let sumMoney = +prompt("Enter amount");
alert((sumMoney * rate) + "UAH");
</script>
</body>