Transport Price

        function solve(arr) {

            var n = Number(arr[0]); //number of kilometers
            var dayOrNight = arr[1];
            var taxiInitialTax = 0.70;
            var taxiDayTariff = 0.79;
            var taxiNightTariff = 0.90;
            var bus = 0.09;
            var train = 0.06;
            var priceTaxi = 0;
            var priceBus = 0;
            var priceTrain = 0;

            if (dayOrNight == "day") {
                priceTaxi = n * taxiDayTariff + taxiInitialTax;
            }
            else {
                priceTaxi = n * taxiNightTariff + taxiInitialTax;
            }
            if (n > 20) {
                priceBus = n * bus;
            }
            else {
                priceBus = 999999;
            }
            if (n > 100) {
                priceTrain = (n * train);
            }
            else {
                priceTrain = 999999;
            }

            var bestPrice = Math.min(priceTaxi, priceBus, priceTrain);
            console.log(bestPrice);

        };