function bike(countYoung, countOld, type) {
    countYoung = +countYoung;
    countOld = +countOld;
    let price = 0;
    let discount = 0;
    let allPrat = countOld + countYoung;



    if (type == "trail") {
        price = (5.50 * countYoung) + (7 * countOld);
    } else if (type == "cross-country") {
        price = (8 * countYoung) + (9.50 * countOld);
    } else if (type == "downhill") {
        price = (12.25 * countYoung) + (13.75 * countOld);
    } else if (type == "road") {
        price = (20 * countYoung) + (21.50 * countOld);
    }
    if (allPrat >= 50) {
        discount = price - (price * 0.75);
    }

    let giveSum = (price - discount) * 0.95;

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


}


 bike(30, 25, "cross-country");
//bike(3, 40, "road");