05. Computer Firm

function firm(input) {
    let n = Number(input.shift());
    let everagrRate = 0;
    let number = 0;
    let sales = 0;
    for (let i = 1; i <= n; i++) {
        let line = Number(input.shift());
        rate = line % 10;
        number = Math.floor(line / 10);
        switch (rate) {
            case 2: sales += number * 0; everagrRate += 2;
                break;
            case 3: sales += number * 0.50; everagrRate += 3;
                break;
            case 4: sales += number * 0.70; everagrRate += 4;
                break;
            case 5: sales += number * 0.85; everagrRate += 5;
                break;
            case 6: sales += number * 1; everagrRate += 6;
        }
    }
    console.log(sales.toFixed(2));
    console.log((everagrRate/n).toFixed(2));
}