Family trip JS

function familyTrip(input) {
    let budget = Number(input[0]);
    let nights = Number(input[1]);
    let pricePerNight = Number(input[2]);
    let extraCostsPercentage = Number(input[3]);

    let allNights = nights * pricePerNight;
    if (nights > 7) {
        allNights = nights * (pricePerNight - (pricePerNight * 5 / 100));
    }
    let allCosts = allNights + budget * extraCostsPercentage / 100;

    if (allCosts <= budget) {
        console.log(`Ivanovi will be left with ${(budget - allCosts).toFixed(2)} leva after vacation.`);
    } else {
        console.log(`${(allCosts - budget).toFixed(2)} leva needed.`);
    }
}