06. Truck Driver

function truckDrivers(input) {
    let season = input[0];
    let km = Number(input[1]);
    let sum = 0;

    if (km > 0 && km <= 5000) {
        switch (season) {
            case 'Spring':
            case 'Autumn':
                sum = 0.75;
                break;
            case 'Summer':
                sum = 0.9;
                break;
            case 'Winter':
                sum = 1.05;
                break;
        }
    } else if (km > 5000 && km <= 10000) {
        switch (season) {
            case 'Spring':
            case 'Autumn':
                sum = 0.95;
                break;
            case 'Summer':
                sum = 1.1;
                break;
            case 'Winter':
                sum = 1.25;
                break;
        }
    } else if (km > 10000 && km <= 20000) {
        sum = 1.45;
    }

    console.log(`${(sum * km * 4 * 0.9).toFixed(2)}`);
}

Решение с тернарен оператор:

function truckDrivers(input) {
    let season = input[0];
    let km = Number(input[1]);

    let sum =
        (km <= 5000 ? (season === 'Summer' ? 0.9 : season === 'Winter' ? 1.05 : 0.75) :
            km <= 10000 ? (season === 'Summer' ? 1.1 : season === 'Winter' ? 1.25 : 0.95) :
                km <= 20000 ? 1.45 : 1) * km * 4 * 0.9;

    console.log(`${sum.toFixed(2)}`);
}