100/100 Solution

function solve() {
    let totalProfit = 0;
    let fansCount = 0;
    let seatPlace = document.getElementsByClassName('seat');
    for (let i = 0; i < seatPlace.length; i++) {
        seatPlace[i].addEventListener('click', getSeat, true);
    }

    let elToPrint = document.querySelector('#summary span').innerHTML;
    let buttonSumarry = document.querySelector('#summary button').addEventListener('click', () => {
        document.querySelector('#summary span').textContent = `${totalProfit} leva, ${fansCount} fans.`;
    });

    function getSeat(e) {
        let newProfit;
        let fans;
        let zones = ["A", "B", "C"];

        let obj = {
            "Seat": e.target.textContent,
            "sector": zones[e.target.parentNode.cellIndex],
            "zone": e.target.parentNode.parentNode.parentNode.parentNode.parentNode.className
        };

        let isAvailable = (e.target.style.backgroundColor === "rgb(255, 0, 0)" ? false : true);
        if (isAvailable) {
            e.target.style.backgroundColor = 'rgb(255,0,0)';
            //e.path[5].className (levski litex vip)
            //e.path[1].cellIndex (0 = A , 1 = B , 2 = C)
            //e.target.innerText ( 1 2 3 4 5)
            //document.querySelector('#summary span').innerHTML (0 leva, 0 fans)



            fansCount++;
            if (obj.zone == "Levski" || obj.zone == "Litex") {
                switch (obj.sector) {
                    case "A":
                        newProfit = 10;
                        totalProfit += newProfit;
                        break;
                    case "B":
                        newProfit = 7;
                        totalProfit += newProfit;
                        break;
                    case "C":
                        newProfit = 5;
                        totalProfit += newProfit;
                        break;
                }
            } else {
                switch (obj.sector) {
                    case "A":
                        newProfit = 25;
                        totalProfit += newProfit;
                        break;
                    case "B":
                        newProfit = 15;
                        totalProfit += newProfit;
                        break;
                    case "C":
                        newProfit = 10;
                        totalProfit += newProfit;
                        break;
                }
            }
            document.getElementById('output').innerHTML += ` Seat ${obj.Seat} in zone ${obj.zone} sector ${obj.sector} was taken.\n`
        }
        else {
            document.getElementById('output').innerHTML += ` Seat ${obj.Seat} in zone ${obj.zone} sector ${obj.sector} is unavailable.\n`;
        }
    }
}