index.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My JavaScript</title>
</head>
<body>
<script src="main.js"></script>
</body>
</html>main.js
'use strict';
let price;
const rate = 1.1;
for(let price = 150; price <= 160; price++){
console.log('Price: ${price}');
for(let amount = 120; amount <= 140; amount+=10){
console.log(price * amount * rate);
}
}